Question

A train 180 meter long crosses a standing man in 12 seconds.find the speed of the train in km per hour.

Answer 1

Speed = Distance
                Time
Speed of the train = (180)m/sec
                               (  12)

Speed of the train = 15 m /sec

Speed of the train = 15m /sec

Formula for  Conversion of m/sec to km/h = 3.6 × Vm/sec = Vkm/h
=54 km / hr

Answer 2

Total distance travelled = 180 m=0.18km Total time taken = 12 sec =0.00333333 Speed= distance travelled/ time taken So, 0.18/0.00333333=54km/hr ..