Use the following information to answer the next two questions.
| A swimming pool near a gymnasium is to be filled using hosepipes. A hosepipe P1 delivers 220 gallons of water an hour while another hosepipe P2 delivers 300 gallons of water an hour. |
If the pipe P1 takes 16.5 hours alone to fill up the pool, then the time taken by the pipe P2 operating alone will be
11
12.1
13.2
16.5