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    Question

    Buses A and B are moving around a circular ground of

    radius 140 m. If the speeds of the buses A and B are 11 m/sec and 20 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 3 round of the ground?
    A 120 Correct Answer Incorrect Answer
    B 44 Correct Answer Incorrect Answer
    C 108 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 × 22/7 × 140 = 880 m So, distance = 880 m  Time taken by bus A to cover 3 rounds of a ground = (880/11) × 3 = 240 Time taken by bus B to cover 3 rounds of a ground = (880/20) × 3 = 132 Required difference = 240 – 132 = 108

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