Q&A for How to Calculate Speed

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  • Question
    64 seconds travel 1000mm?
    Donagan
    Top Answerer
    1000 mm is 1 meter, so the speed is 1 meter in 64 sec, which equals 1/64 of a meter in 1 second. 1/64 = 0.016, so the speed is 0.016 meter per second.
  • Question
    A car travels 1.2 miles in 1 minute and 36 seconds. How fast is the car moving?
    Community Answer
    1 minute and 36 seconds is 96 seconds. Divide 1.2 miles by 96 seconds: that's 0.0125 mile per second. Multiply that by 3600 to get miles per hour.
  • Question
    Which is faster: 1.042 m/s or 0.625 m/s?
    I_l1ke_gam3s
    Community Answer
    1.042 meters per second is faster because it has way more speed than the other. The larger the value of m/s, the faster its speed.
  • Question
    The distance covered by a bike is given by the expression x² - 9 the time taken by the by to cover this distance is given by the expression x -3 second. What is the speed of the bike ?
    Community Answer
    Let's assume the distance is being measured in feet. Speed equals distance divided by time. In this case, the speed equals (x² - 9) / (x - 3) = [(x - 3)(x + 3)] / (x - 3) = (x + 3) feet per second.
  • Question
    A car travels 100 km in 2 hours. What is the speed of the car?
    Community Answer
    Speed equals distance divided by time: 100 km / 2 hours. 100 / 2 = 50 km per hour.
  • Question
    What's your speed if you travel 4.3 km in 1.5 seconds?
    Community Answer
    If you want to express the speed in kilometers per second, simply divide 4.3 km by 1.5 seconds. That's 2.86 kilometers per second.
  • Question
    How many miles per hour if an object moves 6 seconds in .0136 miles?
    Donagan
    Top Answerer
    If you multiply 6 seconds by 600, you get 3600 seconds, or 1 hour. So multiply 0.0136 mile by 600 to get 8.16 miles per hour.
  • Question
    A car travels 15km in 2 hours. What is the speed of the car?
    Donagan
    Top Answerer
    15 km in 2 hours is the same as 7½ km in one hour. The speed is 7.5 km/hr.
  • Question
    A train leaves Lagos at 2040 hours, reaches Abeokuta at 2400hours and stops there for 30 minutes. Then it starts and reaches Zaria at 0600 hours. If Zaria is 1325 km far from Lagos, find the average speed?
    Donagan
    Top Answerer
    The total distance traveled is 1325 km. The first leg of the trip lasts from 8:40 p.m. to midnight, or 3 hours and 20 minutes, or 200 minutes. The second leg of the trip lasts from 12:30 a.m. to 6:00 a.m., or 5 hours and 30 minutes, or 330 minutes. So the total travel time (not counting the layover) is (200 + 330) = 530 minutes. Divide 530 by 60 to get 8.83 hours. Then the average speed is 1325 km / 8.83 hours. Divide both numbers in that fraction by 8.83 to get 150.06 kilometers per hour (basically an average speed of 150 km/hr).
  • Question
    Jane can run at a speed of 20 km/h. How long would it take her to reach the finish line if the racing track measures 15km?
    Donagan
    Top Answerer
    Let's assume she runs 15 km. Let x be the time it takes her to run that distance. Set up this proportion: 20 km / 1 hr = 15 km / x hr. Cross-multiply: 20x = (1)(15). So x = 15/20 = 3/4 hr, or 45 minutes.
  • Question
    A car travelled from 100km in 8 hours and the time taken is 40km in 2 hours. How much the average speed of the whole journey?
    Donagan
    Top Answerer
    Let's assume the car travels 100 km in 8 hours and then travels an additional 40 km in 2 hours. The total distance travelled is 140 km, and the total time travelled is 10 hours. The average speed is 140 / 10 = 14 kilometers per hour.
  • Question
    If I threw a ball and it took 0.53 seconds to travel 3 metres, how fast is it going in metres per second?
    Donagan
    Top Answerer
    Divide 3 meters by 0.53 to get 5.66 meters per second.
  • Question
    A car travels a distance of 270km in 41/2 hours. Find its speed?
    Donagan
    Top Answerer
    Divide 270 km by 4½ to get 60 kilometers per hour.
  • Question
    If someone hits a tennis ball 40 meters in 1.234 seconds, what is the speed?
    Donagan
    Top Answerer
    Divide 40 m by 1.234 to get 32.41 meters per second.
  • Question
    If I run 100meters in 13.63 seconds, how fast am I?
    Donagan
    Top Answerer
    Divide both the distance run and the elapsed time by 13.63 to find the velocity in meters per second: 100 m / 13.63 = 7.34 meters. 13.63 sec / 13.63 = 1 sec. Your velocity is 7.34 meters per second.
  • Question
    A driver spent 45 minutes to cover a distance of 120km. What is the speed of the driver in kilometer per hour?
    Donagan
    Top Answerer
    We multiply 45 minutes -- or ¾ of an hour -- by 4/3 to get 1 hour, so multiply 120 km by 4/3 to get 160 km per hour.
  • Question
    If a man runs 5 km in 30 minutes, at what speed is he running?
    Donagan
    Top Answerer
    He is running at a speed of 1/6 km per minute or approximately 10 km per hour.
  • Question
    500 meters in 6 minutes - how fast is he going?
    Donagan
    Top Answerer
    Divide both the distance and the time by 6 to get 83.33 meters per minute. Divide them by (6)(60)=360 to get 1.38 meters per second.
  • Question
    An object moves so fast it takes light 2 hours to catch up.How do I calculate the speed of the object?
    Donagan
    Top Answerer
    We can't calculate it because we don't know where the object began its journey, so we don't know how far it traveled in 2 hours. In addition, don't know where the light source was at the beginning of the 2 hours, so we don't know how far the light traveled to catch the object.
  • Question
    How long can it take to cover 300km with a maximum speed of 120km/h?
    Donagan
    Top Answerer
    300 / 120 = 2.5 hours (assuming the maximum speed is maintained throughout the entire distance).
  • Question
    If it takes you 4.5 hours to drive from your home to your favorite weekend getaway, which is 315 miles away, then what is your average speed?
    Community Answer
    Speed is distance travelled divided by time, i.e. mile per hours. In this case, the answer is 315 miles/4.5 hours = 70 miles per hour.
  • Question
    What if a train starts moving though 1km in 100s with uniform acceleration, so what will be the speed after 100s?
    Startrekker
    Community Answer
    u = 0, t = 100s , displacement = 1 km = 1000m , v= ? s = ut + (0.5)a (t^2) 2000/10000 = a = 2/10 = 0.2 v= u + at = 0 + (0.2)(100) = 20 m/s.
  • Question
    How can I calculate the top speed of a car?
    Startrekker
    Community Answer
    The top speed of the car depends upon how much work the engine can do in one second and the friction coefficient between the tyre and the road.
  • Question
    A stone is dropped from the top of a cliff which is 80m high. How long does it take to reach the bottom of the cliff?
    Community Answer
    u=0 displacement (x)=-80m (don't worry!: -ve means its downwards) a=g=-10m/s^2 t=? x = ut + (1/2)a.t^2 -80m = (1/2)(-10)(t^2) m/s^2 (160/10)(s^2) = t^2 t= 4s (since time here can't be -ve) The stone will take 4 seconds to reach the ground (or 4.04 seconds if you take g=9.8 m/s^2).
  • Question
    If Usain Bolt runs 100 m in 9.58 seconds, what speed is he going?
    Hann B
    Community Answer
    Speed=Distance travelled/ time so Usain Bolt's speed is 100/9.58=10.438m/s. To convert this to km/hr: (10.438x3600)/1000=37.6km/hr.
  • Question
    if a mousetrap car travels 8.23 meters in 3 seconds what is it's speed?
    Hann B
    Community Answer
    Speed= Distance travelled/ time, so the speed of the car is 8.23/3=2.743m/s.
  • Question
    If a man runs 1.6km in 6.5 minutes (6 minutes 30 seconds), at what speed is he running?
    Donagan
    Top Answerer
    That's the equivalent of 14.77 km/hr.
  • Question
    How fast is man running if he runs 72 ft in6 seconds in miles /hr?
    Donagan
    Top Answerer
    During those six seconds, he is running at the rate of 8.18 miles per hour.
  • Question
    A car traveled from 100km in 8 hrs and time taking is 40km in 2hrs, find the average speed of the whole journey?
    Donagan
    Top Answerer
    The average speed is (100 + 40) km / (8 + 2) hrs = 140 / 10 = 14 km/hr.
  • Question
    If a airship travels 141km in 33 seconds, how fast is it going?
    Donagan
    Top Answerer
    It's traveling at the speed of 15,381.8 km/hr. To calculate that, divide 33 seconds into 3600 seconds (one hour), and then multiply that quotient by 141 km to get km/hr.
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