A scooterist covers a distance of 3 kilometres in 5 minutes. Calculate his speed in:
(a) centimetres per second (cm/s)
(b) metres per second (m/s)
(c ) kilometres per hour (km/h)

Explanation

In order to express the speed in metres per second we should convert the given distance of 3 kilometres into metres and the given time of 5 minutes into seconds, thus in this case: Distance travelled`=3 km=3xx 1000 m= 3000 m`
Time taken=5 minutes`=5xx60` seconds=300 s Now,speed=`("distance travelled")/("time taken")=(3000 m)/(300 s)`
=10 m/s