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What is the correct answer?

4

A tyre has two punctures. The first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat ? 

A. 315min

B. 325min

C. 335min

D. 345min

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