MCQOPTIONS
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| 1. |
Two pipes can fill a cistern in 72 and 90 minutes respectively. If both the pipes are left open how long will it take for the cistern to be half full? |
| A. | 40 minutes |
| B. | 24 minutes |
| C. | 48 minutes |
| D. | 20 minutes |
| Answer» E. | |