- A18
- B60.5
- C20
- D15
Step-by-Step Solution
Combined rate = 1/22 + 1/99 = 9/198 + 2/198 = 11/198 = 1/18 tank per hour, so filling takes 18 hours.
Answer: A) 18
A village tank is filled by a solar pump in 22 hours and by a diesel pump in 99 hours. Running both pumps together, how many hours will filling take?
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