Two filler pipes X and Y can separately fill a tank in 45 and 40 minutes resp

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Question

Two filler pipes X and Y can separately fill a tank in 45 and 40 minutes respectively. They start to fill the tank together but pipe X is turned off after a few minutes and pipe Y fills the rest of the tank in 23 minutes. After how many minutes is pipe X turned off?

Options:

A . 6 min.

B . 9 min.

C . 12 min.

D . none of these

Answer: Option B

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