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## Practice Test Discussion

Q)

If two pipes A and B can fill a tank in t min. If time taken by A alone is 4 minutes more than t and time taken by B alone is 25 minutes more than t, then the time taken by both the pipes together is?

• Explanation

According to the above given formula, Two pipes A and B can together fill a tank in time T. If time taken by pipe A alone is more than T by x and the time taken by pipe B alone is more than T by y, then T is $\sqrt{\mathrm{xy}}$ min.

So,

The tank will be completely filled in 10 min.

Hence option C is correct

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