Task: Question Answering
Input (English): Question: A tank has both an inlet pipe and an outlet pipe. Working alone, the inlet pipe can fill up the tank in 4 hours. Working alone, the outlet pipe can empty out the tank in 8 hours. If it is desired that the tank should be filled, from empty, exactly 6 hours after the inlet pipe is turned on at 9:30am, then at what time should the outlet pipe be opened ?

 Option A: 11:00am

 Option B: 10:30am

 Option C: 9:30am

 Option D: 10:00am

 Option E: 11:30am
Output (English): Option E