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    Question

    Buses A and B are moving around a circular ground of

    radius 280 m. If the speeds of the buses A and B are 15 m/sec and 24 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 110 Correct Answer Incorrect Answer
    B 176 Correct Answer Incorrect Answer
    C 132 Correct Answer Incorrect Answer
    D 118 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Circumference if the ground = 2πr = 2 × 22/7 × 280 = 1760 m So, distance = 1760 m  Time taken by bus A to cover 3 rounds of a ground = (1760/15) × 3 = 352 Time taken by bus B to cover 3 rounds of a ground = (1760/24) × 3 = 220 Required difference = 352 – 220 = 132

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