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## Practice Test Discussion

Q)

A pipe can fill a tank in 20 hours. Due to a leak in the bottom, it is filled in 40 hours. If the tank is full, how much time will the leak take to empty it?

• Explanation

According to the above given formula, if pipe A can completely fils a tank in x hours and pipe B can comletely empty the tank in y hours, then the time taken by both pipes together to fill the tank is $\frac{\mathrm{xy}}{\mathrm{x}-\mathrm{y}}$ hours.

So,

The tank will be filled by both the pipe opened simultaneously in 40 hours

Hence option A is correct

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