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.
    A 25 mins Correct Answer Incorrect Answer
    B 40 mins Correct Answer Incorrect Answer
    C 80 mins Correct Answer Incorrect Answer
    D 60 mins Correct Answer Incorrect Answer

    Solution

    ATQ,

    Image
    Or,5d=4s(t+20) ………………… (1)
    Also,
    Image
    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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