- A10
- B36
- C6
- D15
Step-by-Step Solution
Combined rate = 1/12 + 1/60 = 5/60 + 1/60 = 6/60 = 1/10 tank per hour, so 10 hours.
Answer: A) 10
Two taps fill a school's water tank, one in 12 hours and the other in 60 hours. Running together, how many hours do they take to fill it?
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