Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Bot

Question

Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

Options:

A . 10 min. 20 sec.

B . 11 min. 45 sec.

C . 12 min. 30 sec.

D . 14 min. 40 sec.

Answer: Option D

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