A bicycle completed the first 300.0 m of a ride in 49.3 s. What was the bicycle's average speed in kilometers per hour?

Question

A bicycle completed the first 300.0 m of a ride in 49.3 s. What was the bicycle's average speed in kilometers per hour?

Answer 1

The answer is 21.91 km/h (rounded).

 

You find this by first determining the meters per second (m/s) based on the given info.

 

     300m / 49.3s = 6.09 m/s [approximation, do not round in your calculator until the end for the best result]

 

Then we convert the units of measurement to kilometers per hour (km/h)

 

     Since there are 1000 meters in a kilometer we divide the above answer by 1000.

          Now we have kilometers per second (km/s) which should be around 0.006 approximate.

 

We then take this number and multiply by 60 since there are 60 seconds in an hour giving us kilometers per minute.

Multiply by 60 again since there are 60 minutes in an hour and you will have your final answer of 21.91 in terms of kilometers per hour (km/h).

Answer 2

 

   300 meter        1 km                      60 sec             60 min

-------------- * -------------------- * -------------- * -------------- = 21.9 km per hour

   49.3 sec         1000 meters             1 min            1 hour