📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      If a tank can be filled by a tap in 20 hours, but due to

      an outlet, it actually takes 8 hours longer to fill the tank, find the duration in which the outlet alone would empty the tank?
      A 70 Correct Answer Incorrect Answer
      B 28 Correct Answer Incorrect Answer
      C 36 Correct Answer Incorrect Answer
      D 63 Correct Answer Incorrect Answer

      Solution

      Let tap ‘A’ fill the tank and tap ‘B’ empty the tank. Taking LCM of 20 and 28 = 140 Efficiency of A = 7 Efficiency of (A – B) = 5 Efficiency of B = 7 – 5 = 2 Tap B will empty the tank = 140/2 = 70 So, tap B will empty the tank in 70 hours.

      Practice Next
      ask-question