- A6 hours
- B15 hours
- C10 hours
- D19 hours
Step-by-Step Solution
. Reject : the inlet takes 6 h, so the outlet takes 10 h.
Answer: C) 10 hours
The outlet at the bottom of the cistern takes 4 hours longer to empty it than the inlet takes to fill it. With both open, the empty cistern fills in 15 hours. How long does the outlet alone take to empty the full cistern?
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