MCQOPTIONS
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MCQOPTIONS
| 1. |
Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the time taken to fill the tank. |
| A. | 17 1/7 mins |
| B. | 20 mins |
| C. | none |
| D. | 50 mins |
| Answer» B. 20 mins | |