A tank can be filled by pipes X and Y in \(7\frac{1}{2}\) hours. B

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A tank can be filled by pipes X and Y in \(7\frac{1}{2}\) hours. Both of them are opened for \(2\frac{1}{2}\) hours and then Y is closed. X alone now requires \(6\frac{2}{3}\) hours more to fill the tank. The time required by X to fill the tank alone will be

Options:

A . 8 hr.

B . 10 hr.

C . 12 hr.

D . none of these

Answer: Option B

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Question 6. Two pipes A and B together can fill a cistern in 4 hours. Had the been opened separately , then B would have taken 6 ....taken by A to fill the cistern separately ?

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