- A8.4
- B17.5
- C7
- D35
Step-by-Step Solution
Rate = 1/14 + 1/21 = 3/42 + 2/42 = 5/42 pond per hour, so time = 42/5 = 8.4 hours.
Answer: A) 8.4
A village pond is filled by two canals; one alone would take 14 hours and the other alone 21 hours. With both canals flowing, how many hours will filling take?
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