Question 97

A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in


Tank will be filled in 1 minute = $$\frac{1}{30}-\frac{1}{90}=\frac{3-1}{90}=\frac{2}{90}=\frac{1}{45}$$

So, tank will be filled in 45 minutes.

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