Multiple Choice Questions. Click on the correct answer.
14. A water tank can be filled by one pipe in 10 hours and it can be
emptied by another in 15 hours. If both pipes are open, how long will
it take to fill the tank?
- 30 hours.
- 15 hours.
- 60 hours.
- 45 hours.
- none of these.
Sun Aug 17 22:41:52 MDT 1997
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