MCQOPTIONS
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| 1. |
A tank has two pipes. The first pipe can fill it in 4 hours and the second can empty it in 16 hours. If two pipes be opened together at a time, then the tank will be filled in |
| A. | 10 hours |
| B. | |
| C. | 6 hours |
| D. | |
| Answer» E. | |