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    Question

    Buses A and B are moving around a circular ground of

    radius 210 m. If the speeds of the buses A and B are 16 m/sec and 20 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 2 round of the ground?
    A 20 Correct Answer Incorrect Answer
    B 44 Correct Answer Incorrect Answer
    C 33 Correct Answer Incorrect Answer
    D 88 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Circumference if the ground = 2πr = 2 x 22/7 x 210 = 1320 m So, distance = 1320 m Time taken by bus A to cover 2 rounds of a ground = (1320/16) x 2 = 165 Time taken by bus B to cover 3 rounds of a ground = (1320/20) x 2 = 132 Required difference = 165 - 132 = 33

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