A tyre has two punctures. The first puncture alone would have made the tyre flat in 4 minutes and the second puncture alone would have done in 7 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat ?
Solution: I minute's work of both the punctures = (1/4 + 1/7) = 13/28
So, both the punctures will make the tyre flat in 28/13 minutes. = 2 2/13 min.
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