Question

Time taken by ‘A’ to fill a tank, which is 75% empty, is 30 minutes, while time taken by ‘B’ to fill the same tank, when it is 50% full, is 20 minutes. When the tank is completely empty, both pipes are opened together. Find the time (in minutes) after which ‘A’ must be closed so that the tank gets filled in 25 minutes.

A 10 minutes
B 12 minutes
C 15 minutes
D 18 minutes
E 20 minutes
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