Question

On a 120 km track A train travels the first 40 km at a uniform speed of 40 km/h . Calculate the speed with with which the train should move rest of the track so as to average 60 km/h for the entire trip.​

Answer 1

Answer:

160km/h

Explanation:

let 'x' be speed of to be maintained for next 80km

Avg speed=((speed for 40 km*40)+(speed to be maintained for next 80 km*80))/Total distance

120=(40*40+(x*80))/120

on solving,we get x as 160km/h