Question

A tank is fitted with two taps A and B of different size. If both the taps are opened simultaneously it takes 4 hours to fill the tank. If only tap A is opened for 1 hour and then only tap is opened for 4 hours the tank becomes half. Find the time taken by tap B alone to fill the tank.

A 6 hours

B 8 hours

C 12 hours

D 14 hours