Pipe A is 4 times as fast as B in filling a tank If A takes 20 minutes to fill a tank then what is t...........

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Pipe A is 4 times as fast as B in filling a tank. If A takes 20 minutes to fill a tank, then what is the time taken by both the pipe A and B to fill the tank?

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Explanation:

A takes 20 minutes and it is 4 times faster than B,
it means B will take 80 minutes to fill the tank.
(1/20 + 1/80)*t = 1.
We get t = 16
Hence, option 2 is the correct answer.