Question

A freight train left delhi for mumbai at an average speed of 40 km/hr. two hours later, an express train left delhi for mumbai, following the freight train on a parallel track at an average speed of 60 km/hr. how far from delhi would the express train meet the freight train?

Answer 1

Let the time taken be x

thus according to question

Time taken by first train t1  = x + 2
Time taken by second train t2 = x

as the train meets at the same time so the distance will be same

So     40 ( x+2) = 60x
thus x= 4
thus time taken by first train  = 6 hrs