- A5
- B4.5
- C6
- D16
Step-by-Step Solution
Net rate = 1/4 − 1/20 = 5/20 − 1/20 = 4/20 = 1/5 per hour, so filling takes 5 hours.
Answer: A) 5
A hose fills an aquarium in 4 hours, but a crack in the glass drains a full aquarium in 20 hours. With the hose running and the crack leaking, how many hours does filling take?
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