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A tyre has 3 punctures The first puncture alone would have...

This question belongs to Arithmetic Ability Time And Work
Time and Work
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A tyre has 3 punctures. The first puncture alone would have made the tyre flat in 9 minutes, the second alone would have done it in 18 minutes, the third alone would have done it in 6 minutes. If the air leaks out at a constant rate, then how long (in minutes) does it take for all the punctures together to make it flat?

Answer & Solution
Correct Answer: Option D
Time and Work mcq question image
$$\therefore \frac{{18}}{{2 + 1 + 3}} = 3{\text{ minutes}}$$
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