Question

a man walks at a speed of 72 kmph. he covers a distance of 80 m in:

Answer 1

Speed = 72 km/h = 20 m/s
Distance = 80 m
Time = Distance/Speed
= 80/20
= 4 seconds

Answer 2

m/sec = km/h × 5/18
= 72 × 5/18
= 20 m/sec

80/20 = 4sec
in 4 sec