- A20 h
- B30 h
- C12 h
- D60 h
Step-by-Step Solution
Inlets: . Net rate . Waste → 20 h.
Answer: A) 20 h
Two inlets fill a tank in 20 and 30 hours. Someone opens both but, by mistake, also opens the waste pipe, and notices only after 6 hours, when the tank is just one-fifth full. How long would the waste pipe alone take to empty the full tank?
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