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    Question

    P can construct a robot individually in 20 hours, while

    Q requires 40 hours to complete the same task. If they collaborate, how many hours will it take them to assemble 6 robots?
    A 40 hours Correct Answer Incorrect Answer
    B 30 hours Correct Answer Incorrect Answer
    C 60 hours Correct Answer Incorrect Answer
    D 45 hours Correct Answer Incorrect Answer
    E 80 hours Correct Answer Incorrect Answer

    Solution

    Time taken by both to build one robot = 1/ {1/20 + 1/40} = 1/(3/40) So, time taken by both to build 6 robots = 6 ├Ч (40/3) = 80 hours

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