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## Practice Test Discussion

Q)

Two pipes A and B can fill a tank separately in 10 min and 20 min respectively. If both the pipes are used together, how much time will be taken to fill the tank?

• Explanation

According to the formula, if pipe A can comletely fils a tank in x hours and pipe B can comletely fill a 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 $6\frac{2}{3}$ hours

Hence option D is correct

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