Multiple Choice Questions on A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed........... for CDS Exam Preparation

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Multiple Choice Questions

A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed...........

Quantitative Aptitude (CDS) Time & distance
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    A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, then what is the value of y?

     

    30 km per hour
     

    Incorrect Answer

    35 km per hour
     

    Incorrect Answer

    40 km per hour
     

    Correct Answer

    45 km per hour

    Incorrect Answer
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    Explanation:

    Total distance = 2d

    So according to the question 2d/48 = d/60 + d/y

    1/24 = 1/60 + 1/y

    1/24 = (y+60)/60y

    5y = 2y +120

    3y = 120

    y = 40 km per hour

    By: Munesh Kumari
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