Multiple Choice Questions on Running at 4 5 of its usual speed a train is 20 minutes late Find its usual time in minutes to cover........... for CDS Exam Preparation

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Multiple Choice Questions

Running at 4 5 of its usual speed a train is 20 minutes late Find its usual time in minutes to cover...........

Quantitative Aptitude (CDS) Time & distance
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    Running at 4/5 of its usual speed, a train is 20 minutes late. Find its usual time (in minutes) to cover the journey?

     

    50 minutes
     

    Incorrect Answer

    40 minutes 
     

    Incorrect Answer

    80 minutes
     

    Correct Answer

    70 minutes

    Incorrect Answer
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    Explanation:

    New speed = 4/5 of the usual speed
    New time taken = 5/4 of the usual time 
    So, (5/4 of the usual time) - (usual time) = 20 minutes.
    1/4 of the usual time = 20 minutes
    usual time = 80 minutes.

    By: bhavesh kumar singh
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