MCQOPTIONS
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| 1. |
Pipe A can fill a tank in 45 hrs and pipe B can fill it in 36 hrs. If both the pipes are opened in the empty tank. In how many hours will it be full? |
| A. | 10 hr |
| B. | 15 hr |
| C. | 20 hr |
| D. | 28 hr |
| Answer» D. 28 hr | |