Question

A cyclist rides her bike at a rate of 5 meters per second. What is this rate in kilometers per hour ? How many kilometers will the cyclist travel in 5 hours?

Answer 1

18 km/hr

90 km

Explanation:

We know that there are

1000 m = 1 km

and

3600 s = 1 hr

We need to convert m/s to km/h

5 m 3600s 1 km 18000km 18 km

------ * ------------ * ------------ = --------------- = ------------

s 1 hr 1000m 1000 hr hr

It is 18 km/hr since the units cancel.

We want to know how far the cyclist travels

d=rt

We know the rate 18km/hr and the time = 5 hr

d = 18 km/hr * 5 hr

d =90 km