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    Question

    Aman goes from his home to his office at a speed of 30

    m/s and returns at 50% more speed. If the distance between his home and office is 1,800 metres, then find the average speed of the entire journey. 
    A 32 m/s Correct Answer Incorrect Answer
    B 30 m/s Correct Answer Incorrect Answer
    C 36 m/s Correct Answer Incorrect Answer
    D 26 m/s Correct Answer Incorrect Answer

    Solution

    The speed by which the man returns to his home from his office = 1.5 x 30 = 45 m/s Time taken by the man to reach his office = (1800/30) = 60 seconds Time taken by the man to return to his home from office = (1800/45) = 40 seconds Average speed = [(Total distance) /(Total time) ] = [(2 x 1800) /(60 + 40) ] = (3600/100) = 36 m/s

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