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
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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
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