11)

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

12)

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