Task: Question Answering
Input (English): Question: It takes Avery 3 hours to build a brick wall while Tom can do it in 2 hours. If the two start working together and after an hour Avery leaves, how much time will it take Tom to complete the wall on his own?

 Option A: 20

 Option B: 30

 Option C: 40

 Option D: 50

 Option E: 60
Output (English): Option A