1)

Pipes A and B are filling pipes while pipe C is an emptying pipe. A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened, The tank will be empty after:

, Avg: 01:53 , 100%✓ SSC CGL 2019

A)

15 minutes

B)

18 minutes

C)

12 minutes

D)

16 minutes

2)

Pipes A and B can fill a tank in 16 hours and 24 hours, respectively and pipe C alone can empty the full tank in x hours. All the pipes were opened together at 10:30 a.m., but C was closed at 2:30 p.m. If the tank was full at 8:30 p.m. on the same day, then what is the value of x?

, Avg: 02:17 , 100%✓ SSC CGL 2019

A)

64

B)

48

C)

45

D)

96