Two pipes X and Y can fill a cistern in 20 minutes and 30 minutes respectively. A third pipe Z can empty it in 40 minutes. How long would it take to fill the cistern if all the three pipes are opened at the same time? Options: A . &nbsp \(13\frac{1}{3}\) min B . &nbsp \(15\frac{1}{5}\) min. C . &nbsp \(17\frac{1}{7}\) min. D . &nbspnone of these

Two pipes X and Y can fill a cistern in 20 minutes and 30 minutes respectivel

Question

Two pipes X and Y can fill a cistern in 20 minutes and 30 minutes respectively. A third pipe Z can empty it in 40 minutes. How long would it take to fill the cistern if all the three pipes are opened at the same time?

Options:

A . \(13\frac{1}{3}\)min

B . \(15\frac{1}{5}\) min.

C . \(17\frac{1}{7}\) min.

D . none of these

Answer: Option C

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Question 1. A tap can fill a tank in 16 minutes and another can empty it in 8 minutes. If the tank is already full and both the ....filled completely or emptied completely as the case may be?

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