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      Question

      A alone can assemble 40 mobile phones in 10 hours, while

      B alone can assemble the same number in 15 hours. Working together, in how many hours can A and B assemble 120 mobile phones?
      A 20 hrs Correct Answer Incorrect Answer
      B 12 hrs Correct Answer Incorrect Answer
      C 15 hrs Correct Answer Incorrect Answer
      D 18 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      AтАЩs rate = 40 / 10 = 4 phones/hour BтАЩs rate = 40 / 15 = 8/3 phones/hour Combined rate = 4 + 8/3 = 20/3 phones/hour Time for 120 phones = 120 ├╖ (20/3) = 120 ├Ч 3 / 20 = 18 hours

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