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# Pipes & Cistern Quiz : 20.03.2021

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Question 1

Two pipes A and B can fill a tank in 6 and 8 hours respectively. Both pipes are opened together. Pipe B is turned off after some time. Then tank is full in 4 hrs. For how long B was kept opened?

Question 2

Two pipes A and B can fill a tank in 10 minutes and 20 minutes respectively. A third pipe C can empty the tank in 15 minutes. First A and B are opened for 4 minutes and after that pipe C is also opened. Total time (in minutes) in which the tank will be filled up is

Question 3

Two pipes A and B fill a tank in 12 and 15 minutes respectively. Both are opened and at the of 3 minutes, A is turned off. How much time will B take to fill the remaining amount?

Question 4

Taps A and B fill a tank in 10 and 15 hours respectively and a tap C can empty it in 20 hrs. If all the taps are opened together alternatively (each for an hour) in order A, B and C respectively. In how many hours will the tank be filled completely?

Question 5

A cistern can be filled by three pipes A, B and C alone in 12 hrs, 24 hrs and 48 hrs respectively. There is an opening D in the cistern that empties the cistern at the rate of 6m/h. If the cistern is 96 m deep then, in how much time will it be filled upto 72m of its depth if all the pipes are opened together at the start but B is closed after an hour.

Question 6

A cistern is normally filled in 8 hrs, but take 2 hrs longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in:

Question 7

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
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