Suppose that you drive the 10.0 km from your school to home in 20.0 min. Calculate your average speed 

(a) In kilometers per hour (km/h) and

(b) In meters per second (m/s).

Strategy

First we calculate the average speed using the given units. Then we can get the average speed into the desired units by picking the correct conversion factor and multiplying by it. The correct conversion factor is the one that cancels the unwanted unit and leaves the desired unit in its place.