Q&A for How to Find Speed

Return to Full Article

Coming soon

Add New Question

Question

Distance is 72 km and time is 56 minutes. What is the speed?

Community Answer

Speed = distance/time. So in this case you would divide 76km by 56 minutes and you would come up with 1.29 km per minute.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 9 Helpful 27
Question

An object travels 32 meters in 2 hours, what is the speed of the object?

Community Answer

You use the formula of speed = distance / time, and its unit is meter/second. Distance = 32 meters, time = 2 hours. Since the unit of speed is meter per second, you need to change the time to seconds. There are 3600 seconds in one hour, so time = 2 hours x 3600 seconds = 7200. Now solve speed = 32 / 7200 = 0.0044 m/s.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 16 Helpful 12
Question

A man travels a distance of 84 km in 1 hour 20 minutes. Find his average speed?

Community Answer

Speed = Distance / Time. So, 84, the distance traveled, divided by the total number of minutes it took to get there, which is 80, would be 1.05. Therefore, your answer is 1.05 km/s.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 22 Helpful 14
Question

A car moves 120 miles in h hour, what will be it's average speed per hour?

Donagan

Top Answerer

d = rt, so d/t = r, where d is the distance traveled, t is the time elapsed, and r is the rate or speed. So the average speed is 120 miles / h hours = (120 / h) miles per hour.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 0 Helpful 0
Question

Amy drove 200 miles at an average speed of 10 mph faster than the usual average speed. If she completed trip in 1 hour less than usual, what is her usual driving speed in mph?

Donagan

Top Answerer

r is her usual speed in mph, t is her usual time in hours, and d is the distance traveled. d = (r)(t) = (r + 10)(t - 1) = rt - r + 10t - 10. Then rt = rt - r +10t - 10. That means (-r + 10t - 10) = 0. Then (-r + 10t = 10, and r = 10t -10. d = 200 = rt = (10t - 10)(t) = 10t² - 10t = 200. Divide the last part by 10: t² - t = 20, and t² - t - 20 = 0. Then (t - 5)(t + 4) = 0, and t equals either -4 hours or 5 hours. The elapsed time cannot be a negative number, so the usual elapsed time (t) = 5 hours. Then her usual speed (r) is 200 miles / 5 hours = 40 miles per hour.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 0 Helpful 0