question_answer

Pipe A alone can fill a tank in 8 hours. Pipe B alone can fill the same tank in 6 hours. If both the pipes are opened but after 2 hours pipe A is closed, then pipe B will fill the tank in

A)  6 hrs                           

B)  hrs

C)  4 hrs                           

D)   hrs

Correct Answer: D

Solution :

After 2 hours  filled 28 litres  litres remaining filled by only B.