MCQOPTIONS
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MCQOPTIONS
| 1. |
Two pipes P and Q can fill a tank in 6 hours and 9 hours respectively, while a third pipe R can empty the tank in 12 hours. Initially, P and R are open for 4 hours. Then P is closed and Q is opened. After 6 more hours, R is closed. The total time taken to fill the tank (in hours) is ____. |
| A. | 13.5 |
| B. | 14.5 |
| C. | 15.5 |
| D. | 16.5 |
| Answer» C. 15.5 | |