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Home Aptitude Pipes and Cistern Comments

  • Question
  • Two pipes, when working one at a time, can fill a cistern in 3 hhrs and 4 hrs, resp while a third pipe can drain the cistern empty in 8 hrs. All the three pipes were opened together when the cistern was 1/12 full. How long did it take for the cistern to be completely full?


  • Options
  • A. 2 hrs
  • B. 1 hr 45 min
  • C. 2 hr 10 min
  • D. 2 hr 11 min

  • Correct Answer
  • 2 hrs 

  • Tags: Bank Exams

    Pipes and Cistern problems


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    • 1. An electric pump can fill a tank in 2 hours. Because of a leak in the tank, it was taking 21?2 hours to fill the tank. The leak can drain all the water off the tank in how many hours?

    • Options
    • A. 9
    • B. 10
    • C. 10.5
    • D. 11.5
    • Discuss
    • 2. A cistern has one inlet, L and one inlet, M. L takes 5 hours to fill the empty tank, when M is not open and M takes 8 hours to empty the full tank, if the tank is two fifth full, how much time will it take to fill the tank completely when both L and M are opened simultaneously? (in hours)

    • Options
    • A. 5 hours
    • B. 3 hours
    • C. 6 hours
    • D. 8 hours
    • Discuss
    • 3. A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

    • Options
    • A. It fills in 4.8 min
    • B. It empties in 4.8 min
    • C. It fills in 5.6 min
    • D. It empties in 5.6 min
    • Discuss
    • 4. 18 buckets of water fill a tank when the capacity of each bucket is 8 litres. How many buckets will be needed to fill the same tank, if the capacity of the bucket is 12 litres?

    • Options
    • A. 12
    • B. 13.5
    • C. 24
    • D. Data insufficient
    • Discuss
    • 5. Pipes A and B can fill a cistern in 15 hours together. But ifthese pipes operate separately A takes 40 hours less than Bto fill the tank. In how many hours the pipe A will fill thecistern working alone?

    • Options
    • A. 60
    • B. 20
    • C. 40
    • D. 15
    • Discuss
    • 6. A swimming pool is filled in 10 hours by three tankers A, B and C. The tanker C is twice as fast as B and B is twice as fast as A. How much time will tanker A alone take to fill the swimming pool?

    • Options
    • A. 90 hours
    • B. 40 hours
    • C. 70 hours
    • D. 80 hours
    • Discuss
    • 7. Two taps X and Y can fill a tank in 15 hours and 20 hours respectively. If the two taps are opened at 2 p.m., then at what time (in p.m.) should the tap X be closed to completely fill the tank at exactly 2 a.m.?

    • Options
    • A. 8
    • B. 7
    • C. 9
    • D. 10
    • Discuss
    • 8. A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.

    • Options
    • A. 1/2
    • B. 7/15
    • C. 8/15
    • D. 1/9
    • Discuss
    • 9. A problem is given to three students whose chances of solving it are 1/2, 1/3 and 1/4 respectively. What is the probability that the problem will be solved?

    • Options
    • A. 1/4
    • B. 1/2
    • C. 3/4
    • D. 7/12
    • Discuss
    • 10. Two cards are drawn at random from a pack of 52 cards.what is the probability that either both are black or both are queen?

    • Options
    • A. 52/221
    • B. 55/190
    • C. 55/221
    • D. 19/221
    • Discuss


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