1)

Two pipes A and B can fill a tank in 15 hours and 18 hours, respectively. Both pipes are opened simultaneously to fill the tank. In how many hours will the empty tank be filled?

, Avg: 00:52 , 100%✓ SSC CPO 2020

A)

\(8 \frac{2}{11}\)

B)

\(7 \frac{2}{11}\)

C)

\(9 \frac{2}{11}\)

D)

\(10 \frac{2}{11}\)

2)

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 A is closed after 10 hours. After how many hours will the remaining part of the tank be filled?

, Avg: 01:54 , 66%✓ SSC CPO 2020

A)

10

B)

20

C)

12.5

D)

15.5

3)

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?

, Avg: 01:01 , 65%✓ SSC CPO 2020

A)

9

B)

10

C)

15

D)

18

4)

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?

, Avg: 00:39 , 100%✓ SSC CPO 2020

A)

30 / 7

B)

20 / 7

C)

50 / 7

D)

15 / 7

5)

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?

, Avg: 01:31 , 100%✓ SSC CPO 2020

A)

6

B)

3

C)

4

D)

5

6)

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?

, Avg: 03:00 , 100%✓ SSC CPO 2020

A)

15

B)

10

C)

9

D)

18

7)

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?

, Avg: 00:17 , 76%✓ SSC CPO 2020

A)

21

B)

10

C)

30

D)

15

8)

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.

9)

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 ?

, Avg: 01:56 , 100%✓ SSC CPO 2020

A)

5 hours

B)

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

C)

2 hours

D)

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

10)

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 ?

, Avg: 00:19 , 100%✓ SSC CPO 2020

A)

10 hours 24 minutes

B)

9 hours 30 minutes

C)

8 hours

D)

7 hours 12 minutes