Question

a car travels a distance of 15 km in 20 minutes find the speed of car in metre per second

Answer 1

If the car travels 15km in 20 minutes, and 20 minutes are a third of an hour, so the speed per hour is : (15km * 3)/(20min * 3) = 45km/60min, as 60min is an hour so it’s equal to 45km/h.

Same way an hour has 3600 seconds so the speed for second is: (45km / 3600)/(1h / 3600) = 0.0125km/1s = 12.5m/s.

Answer 2

distance=15km=15000m
Speed=?
time=20minutes=20×60second=1200sec
speed=distance/time
Speed=15000/1200m/s
=12.5m/s