Question
Two taps can fill a cistern in 20 hours and 13 hours,
respectively. A third tap can empty it in 12 hours. How long will it take to fill the empty cistern, if all of them are opened together?ย ยSolution
Letโs assume the total work (i.e., filling the cistern) is 1 unit .
- Tap A fills in 20 hours โ Rate = 1/20
- Tap B fills in 13 hours โ Rate = 1/13
- Tap C empties in 12 hours โ Rate = โ1/12 (since it removes water)
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