A pipe can fill a tank in 'x' hours and another pipe can empty it in'y' (y > x) hours. If both the pipes are open , in how many hours will the tank be filled ?

A pipe can fill a tank in 'x' hours and another pipe can empty it in'y' (y > x) hours. If both the pipes are open , in how many hours will the tank be filled ?
1). (x-y) hours
2). (y-x) hours
3). $\frac{xy}{x-y}$ hours
4). $\frac{xy}{y-x}$ hours

---

Join Telegram Group

Answer This Question
Name:
Email:
Answer :
Sum of (2+1)
Submit:

Other Questions

1. Two pipes A and B can fill a cistern in $37\frac{1}{2}$ minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled just in half an hour, If the pipe B is turned off after :

2. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternatively, the tank will be full in :

3. 12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours day will empty the same reservoir in 12 days

4. A cistern has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours, in how many hours will the cistern be emptied If both the pipes are opened together when 3/4 of the cistern in already full of water

5. Having the same capacity 9 taps fill up a water tank in 20 minutes. How many taps of the same capacity are required to fill up the same water tank in 15 minutes

6. A ieak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 litres a minute. When the tank is full , the inlet is opened and due to the leak the tank is empty in 8 hours. Find the capacity of the tank.

7. A pump can fill a tank with water in 2 hours. Because of a leak in the tank it was taking $2\frac{1}{3}$ hours to fill the tank.The leak can drain all the water off the tank in :

8. A Boy and girl together fill a cistern with water. The boy pours 4 litres of water every 3 minutes and the girl pours 3 litres every 4 minutes. How much time will it take to fill 100 litres of water in the cistern

9. Three pipes P, Q and R can separately fill a cistern in 4,8 and 12 hours respectively. Another pipe S can empty the completely filled cistern in 10 hours. Which of the following arrangements will fill the empty cistern in less time than others

10. Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 minutes. in how much time the third pipe alone can empty the cistern