$A$ 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? (in $minutes$)
- A$1 \frac{1}{2}$
- B$3 \frac{1}{2}$
- C$3 \frac{3}{5}$
- D$4 \frac{1}{4}$
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