One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in?

Q. Pipes

A

and

B

can fill a tank in

5

hours and

6

hours respectively. Another pipe

C

can empty the tank in

12

hours. If all the three pipes are opened together, how much time will it take to fill the tank?

Q. Pipe

A

alone can fill one tank in

6

hours more than it takes pipe

B

alone to fill one tank. Together, both pipes can fill one tank in

4

hrs. How long will it take pipe

A

alone to fill one tank?

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A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice, as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

The correct option is B 35 hrs Suppose pipe A alone takes x hours to fill the tank. Then, pipes B and C will take x2andx4 hours respectively to fill the tank. ∴ 1x+2x+4x=15 ⇔ 7x=15 ⇔ x=35hrs.