- A7 h
- B9 h
- C14 h
- D3.5 h
Step-by-Step Solution
One pump does half the work per hour, so it needs twice as long: 14 h. (3.5 h halves the time instead.)
Answer: C) 14 h
Two identical pumps together fill a pond in 7 hours. How long would one pump take alone?
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