When there is a decrease of 5 km / hr in the usual uniform speed of a goods train, due to track repair work going on it takes 4 hours more than the usual time for travelling the distance of 400 km. Find the usual speed of the goods train.
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Answer:
Answer: Speed of train is 25 km/h
Solution: Let the speed of train be x km/h
As we know that Time taken in a journey = Distance / speed
when speed decreased by 5 km/h
than speed of train( x-5) km/h
Time taken by usual speed = 400/x
Time taken by decreased speed 400 /(x-5),extra time 4 hours
Discard the negative value since speed can't be negative.
So, speed of train is 25 km/h
Hope it helps you.
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