1)

Pipes A and B can empty a full tank in 36 and 45 minutes, respectively, whereas pipe C alone can fill the tank in 15 minutes. B and C are opened together for 15 minutes, and then both are turned off and A is opened. Pipe A will empty the tank in (in minutes):

SSC CHSL 2021

A)

30

B)

18

C)

20

D)

24

2)

Tap P can fill a cistern in 6 hours and tap Q can empty the full cistern in 10 hours. If both taps P and Q are kept open simultaneously, then in how many hours will the empty cistern be completely full ?

SSC CHSL 2021

A)

15

B)

18

C)

12

D)

16

3)

A tap can fill a tank in 4 hours. Another tap can fill the same tank in 6 hours. If both the taps are opened at the same time, then in how much time will the empty tank be filled completely?

SSC CHSL 2021

A)

3 h

B)

2 h 30 min

C)

2 h

D)

2 h 24 min