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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 × (40/3) = 80 hours

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