- A8
- B25
- C9
- D7.5
Step-by-Step Solution
Combined rate = 1/10 + 1/40 = 4/40 + 1/40 = 5/40 = 1/8 of the tank per hour, so 8 hours.
Answer: A) 8
Hose P can fill a garden tank in 10 hours and hose Q can fill it in 40 hours. Working together, in how many hours will they fill the empty tank?
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