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      Question

      β€˜P’ can complete 40% of a

      task in 24 days, while β€˜Q’ can complete 25% of the task in 20 days. How long will it take approximately for β€˜P’ and β€˜Q’ together to finish 75% of the entire work?
      A 10.5 days Correct Answer Incorrect Answer
      B 25.7 days Correct Answer Incorrect Answer
      C 45.02 days Correct Answer Incorrect Answer
      D None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Time taken by β€˜P’ to complete the whole task = 24/0.40 = 60 days Time taken by β€˜Q’ to complete the whole task = 20/0.25 = 80 days Let the total amount of work = 480 units Amount of work done by β€˜P’ in one day = 480/60 = 8 units Amount of work done by β€˜Q’ in one day = 480/80 = 6 units Combined work per day = 8 + 6 = 14 units Desired time = (0.75 Γ— 480)/14 = 25.71 days (approximately 25.7 days)

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