Question

the speed of train is 72 km per hour find its speed in meter per second

Answer 1

Speed in km/hr = 72 km/hr
Speed in m/sec = speed in km/hr * 5/18
= 72 * 5 /18
= 20 m / sec

Answer 2

1 km=1000 m
1 hour=3600sec

72km=72000m

72000m/3600sec
720m/36sec is ur answer

hope it helps you