Directions: Read the following passage carefully and answer the question given…

Directions: Read the following passage carefully and answer the question given below.
A hollow cylinder A of radius 14 cm is full of water and a solid cylinder B of radius 7 cm is put inside the hollow cylinder, after which the remaining quantity of water is 9240 cm3. The height of both cylinders is the same.

If there is a leak in cylinder B which can empty it at 0.5 cm3/sec, then in how much time will the cylinder be emptied? (in minutes)