Mathematics · Time and Work
A cistern has a hole in the bottom through which water is leaking. A tap can fill the cistern in 3 hours and the hole in the bottom can empty the fully filled cistern in 5 hours. If both the tap and the hole are open, then what will be the time taken to completely fill the empty cistern?
- 18 hours
- 212.8 hours
- 35.6 hours
- 47.5 hours✓
Correct answer
7.5 hours
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