Question

12.On a 120km track a train travels the first 30km at a uniform speed of 30km/h.
calculate the speed with which the train should move the rest of the track so
as to get the average speed of 60km/h for the entire track.​

Answer 1

The train cover 30km of 120km in with the speed of 30

let 30km/60minut=2minut per km

the left distance is 120-30=90

60km/h. /90km=1.5

it's means the train cover it's distance in 1h30m