Question
Due to traffic, the speed of a train was reduced to 4/5 of
its regular speed, which caused a delay of 20 minutes in reaching the destination. Find the usual time taken by the train to complete the journey.Solution
ATQ,
Or,5d=4s(t+20) ………………… (1)
Also,
Or, d = s × t ………………... (2)
On combining equation (1) and (2), we get:
5st = 4s(t+20)
Or, 5st = 4st+80s
Or, st= 80s
Or, t = 80
So, the usual time taken by the train is 80 minutes.
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