Study the given pattern carefully and select the number from among the given options that can replace the question mark (?) in it.
A tyre has two punctures. The first puncture alone would have made the tyre flat in 9 min and the second alone would have done it in 6 min. If air leaks out at a constant rate, how long will it take both the punctures together to make the tyre flat?
1 \( \frac{1}{2} \) min
3 \( \frac{1}{2} \) min
3 \( \frac{3}{5} \) min
4 \( \frac{1}{4} \) min