Given: A train travels 700 meter in 35 seconds.
We need to calculate speed in km h−1
Distance =700 meter
=700×11000km
=710km [1km=1000m,1m=11000km]
Time =35 second
=35×160minute[1min=60seconds
⇒1sec=160minute]
=35×160×160hour[1hour=60min
⇒1min=160hour]
=353600
∵Speed=distanceTime
=710353600 km/h
=72 km/h
Hence, the speed of the train is 72 km/h.