Task: Question Answering
Input (English): Question: A cistern is filled by pipe A in 20 hours and the full cistern can be leaked out by an exhaust pipe B in 25 hours. If both the pipes are opened, in what time the cistern is full?

 Option A: 50hrs

 Option B: 60hrs

 Option C: 70hrs

 Option D: 80hrs

 Option E: 100hrs
Output (English): Option E