Task: Question Answering
Input (English): Question: A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

 Option A: 6

 Option B: 7

 Option C: 8

 Option D: 5

 Option E: 3
Output (English): Option A