Task: Question Answering
Input (English): Problem: a cistern is filled by pipe a in 12 hours and the full cistern can be leaked out by an exhaust pipe b in 18 hours. if both the pipes are opened, in what time the cistern is full ?
Options: a. 50 hrs, b. 60 hrs, c. 36 hrs, d. 80 hrs, e. 90 hrs
Output (English): c