Task: Question Answering
Input (English): Question: Pipe A can fill a tank in 10 hours. Due to a leak at the bottom, it takes 15 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?

 Option A: 76

 Option B: 84

 Option C: 56

 Option D: 75

 Option E: 30
Output (English): Option E