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      Question

      Komal and Seema individually can complete a task in

      β€˜2a’ hours and β€˜7a’ hours respectively. If they together can complete halfΒ of the work in 7 hours, then find the value of β€˜a’.
      A 4 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 7 Correct Answer Incorrect Answer
      E 9 Correct Answer Incorrect Answer

      Solution

      According to the question, => 7 x [(1/2a) + (1/7a)] = 1/2 => 7 x (9/14a) = 1/2 => a = 9

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