Calculate the time

Level pending

Two taps A and B can seperately fill a tank in 12 and 15 minutes respectively. Both the taps are opened together, but 4 minutes after the start, the tap A turned off. How much time will it take in minutes to fully fill the tank?


The answer is 10.

Vikram Chugh by Vikram Chugh , 22, India

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1 solution

Ossama Ismail
Jan 2, 2021

Assume that the total time required to fill the tank is x x . After 4 minutes tap A fills 4 12 \frac{4}{12} of the tank.

The time required to fill the remainder of the tank can be found from the following equation: 4 12 + x 15 = 1 \frac{4}{12} + \frac{x}{15} = 1 .

x = 10 x = 10 minutes.

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