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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 10 m/sec and 15 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 88 Correct Answer Incorrect Answer
    B 76 Correct Answer Incorrect Answer
    C 32 Correct Answer Incorrect Answer
    D 65 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Circumference if the ground = 2πr = 2 × 22/7 × 210 = 1320 m So, distance = 1320 m  Time taken by bus A to cover 2 rounds of a ground = (1320/10) × 2 = 264 Time taken by bus B to cover 2 rounds of a ground = (1320/15) × 2 = 176 Required difference = 264 – 176 = 88

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