Question
A tank has two pipes A and B. Pipe A is for filling the tank and Pipe B is for emptying the tank. Pipe A can fill the tank in 20 hours and Pipe B can empty the tank in 25 hours. How many hours will it take to completely fill a one-fourth empty tank?
Answer: Option B
:
B
In one hour pipe A can fill 10020 = 5% of the tank
In one hour pipe B can empty 10025 = 4% of the tank
(A+B)'s work = 5-4 = 1%
To fill a one fourth of empty tank, it will take = 251 = 25 hours
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:
B
In one hour pipe A can fill 10020 = 5% of the tank
In one hour pipe B can empty 10025 = 4% of the tank
(A+B)'s work = 5-4 = 1%
To fill a one fourth of empty tank, it will take = 251 = 25 hours
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