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OpenStudy (anonymous):
A car tyre has two punctures. By itself, the first puncture would make the tyre flat in 15 minutes. By itself, the second puncture would make the tyre flat in 12 minutes. How long will it take for both punctures together to make the tyre flat (assuming that the air leaks out at a constant rate)?
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OpenStudy (anonymous):
is it 20/3 units
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