New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    132 unit of work can be completed by P alone in 22 days. P started working alone and joined by Q after 10 days such that they completed the remaining work in 6 days. Find the number of days taken by Q to complete the whole work alone.

    A 9 days Correct Answer Incorrect Answer
    B 30 days Correct Answer Incorrect Answer
    C 22 days Correct Answer Incorrect Answer
    D 37.5 days Correct Answer Incorrect Answer
    E 38 days Correct Answer Incorrect Answer

    Solution

    Let the efficiency of Q = x units/day Efficiency of P = (132/22) = 6 units/day According to question: 6 × 10 + (6 + x) × 6 = 132 Or, 60 + 36 + 6x = 132 Or, 6x = 132 – 96 Or, 6x = 36 Or, x = 6 Number of days taken by Q to complete the work alone = (132/6) = 22 days

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