Question

on 150 km track a train travels the first 75 km at uniform speed of 60km/h. how far must the train travels the next 75 km so as the average speed of entire trip is 75 km/h​

Answer 1

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Let the speed of the train for next 30 km be "x".

Since, t=sd

So, time taken by the train for first 30 km,

t1=30km/h30km=1h

Time taken by the train to travel next 30 km:

t2=xkm/h30km=(30/x)h

Time taken for the entire trip:

t=4km/h60km=1.5h

So, 1+x30=1.5

⇒x=60km/h