Task: Question Answering
Input (English): Problem: 2 pipes can separately fill a tank in 20 hrs and 30 hrs respectively. both the pipes are opened to fillthe tank, a leak develops in the tank through which one - third of water supplied by both the pipes goes out. what is the total time taken to fill the tank ?
Options: a. 10 hrs, b. 12 hrs, c. 16 hrs, d. 18 hrs, e. 20 hrs
Output (English): c