[3 ⅗ min] A tyre has two punctures. The first puncture alone would have made the tyre flat in 9 minutes and th

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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 ?

3 ⅕ min

3 ⅖ min

3 ⅗ min

3 ⅘ min

Explanation:

Do not be confused, Take this question same as that of work done questions. Like work done by 1st puncture in 1 minute and by second in 1 minute.
Lets Solve it:
1 minute work done by both the punctures =
(1/9+1/6)=(5/18)
So both punctures will make the type flat in
(18/5)mins=3 ⅗ mins

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