Question

On a track of 100km the train covers first 30 km with 30km/hwhat should be the speed of the train for the next 70km so that the average speed of the train remains 50km/h. For the entire trip

Answer 1

Distance=100km

Initial distance=30km

Also,u=30km/h

Average speed=u+v/2

50=30+v/2

100=30+v

V=70km/h