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    Question

    A civil contractor planned to build an over bridge of 3

    km distance in 600 days. For this purpose, he employed 90 workers. After 200 days of work, it was observed that only 0.5 km of the bridge was completed. What is the number of extra workers required to complete the work on time
    A 120 Correct Answer Incorrect Answer
    B 110 Correct Answer Incorrect Answer
    C 135 Correct Answer Incorrect Answer
    D 150 Correct Answer Incorrect Answer

    Solution

    W1=1/6, W2=5/6 (M1 × D1× H1)/W1= (M2 × D2 × H2)/W2 (90 × 200)/1/6 = (M2 × 400)/5/6     M2 = 225   Þ Extra people = 225 – 90 = 135.

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