11)

When operated separately, pipe A takes 5 hours less than pipe B to fill a cistern, and when both pipes are operated together, the cistern gets filled in 6 hours. In how much time (in hours) will pipe B fill the cistern, if operated separately?

SSC CPO 2020

A)

9

B)

10

C)

15

D)

18

12)

Two pipes can fill a tank in 15 hours and 4 hours, respectively, while a third pipe can empty it in 12 hours. How long (in hours) will it take to fill the empty tank if all the three pipes are opened simultaneously?

SSC CPO 2020

A)

30 / 7

B)

20 / 7

C)

50 / 7

D)

15 / 7

13)

Pipes A, B and C can fill an empty tank in (30/7) hours if all the three pipes are opened simultaneously. A and B are filling pipes and C is an emptying pipe. Pipe A can fill the tank in 15 hours and pipe C can empty it in 12 hours. In how long (in hours) can pipe B alone fill the empty tank?

SSC CPO 2020

A)

6

B)

3

C)

4

D)

5

14)

When operated separately, pipe A takes 5 hours less than pipe B to fill a cistern, and when operated together, the cistern gets filled in 6 hours. In how much time (in hours) will pipe A fill the cistern, if operated separately?

SSC CPO 2020

A)

15

B)

10

C)

9

D)

18

15)

A pump can fill a tank with water in 3 hours. Because of a leak, it took  \(3\frac{1}{3}\) hours to fill the tank. In how many hours can the leak alone drain all the water of the tank when it is full?

SSC CPO 2020

A)

21

B)

10

C)

30

D)

15

16)

Pipes A, B and C can fill a tank in 15, 30 and 40 hours, respectively. Pipes A, B and C are opened at 6 a.m., 8 a.m. and 10 a.m., respectively, on the same day. When will the tank be full?

SSC CPO 2020

A)

11:20 p.m.

B)

3:20 p.m.

C)

7:20 p.m.

D)

5:20 p.m.

17)

Pipes A and B can fill a tank in 16 hours and 24 hours, respectively, whereas pipe C can empty the full tank in 40 hours. All three pipes are opened together, but pipe C is closed after 10 hours. After how many hours will the remaining part of the tank be filled ?

SSC CPO 2020

A)

5 hours

B)

\(2 \frac{1}{2}\) hours

C)

2 hours

D)

\(5 \frac{1}{2}\) hours

18)

Two pipes A and B can fill a tank in 12 hours and 18 hours, respectively. Both pipes are opened simultaneously. In how much time will the empty tank be filled completely ?

SSC CPO 2020

A)

10 hours 24 minutes

B)

9 hours 30 minutes

C)

8 hours

D)

7 hours 12 minutes

19)

A pump can fill a tank with water in 1 hour. Because of a leak, it took \(1{1\over3}\) hours to fill the tank. In how many hours can the leak alone drain all the water of the tank when it is full?

SSC CPO 2020

A)

2

B)

5

C)

4

D)

1

20)

Two pipes A and B can fill a cistern in \(12\frac{1}{2} \) hours and 25 hours, respectively. The pipes are opened simultaneously and it is found that due to a leakage in the bottom, it took 1 hour 40 minutes more to fill the cistern. When the cistern is full, in how much time will the leak empty the cistern?

SSC CPO 2020

A)

48 hours

B)

42 hours

C)

45 hours

D)

50 hours