Task: Question Answering
Input (English): Question: Two taps can separately fill a cistern 5 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?

 Option A: A

 Option B: B

 Option C: C

 Option D: D

 Option E: E
Output (English): Option E