Task: Question Answering
Input (English): Question: A tyre has two punctures. The first puncture along 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?

 Option A: 1 1⁄2 minutes

 Option B: 3 1⁄2 minutes

 Option C: 3 3⁄5 minutes

 Option D: 4 1⁄4 minutes

 Option E: None of these
Output (English): Option C