A tyre has two punctures. The first puncture alone would have made the tyre flat in 10 min and second alone would have done it in 20min. If air leaks out at a constant rate how long does it take both

 A tyre has two punctures. The first puncture alone would have made the tyre flat in 10 min and second alone would have done it in 20min. If air leaks out at a constant rate how long does it take both

A). 6  22/3

B). 6  2/3

C). 6  1/3

D).

6 4/3

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