- A15.6
- B32.5
- C13
- D18
Step-by-Step Solution
Combined rate = 1/26 + 1/39 = 3/78 + 2/78 = 5/78 of the drum per minute, so time = 78/5 = 15.6 minutes.
Answer: A) 15.6
An inlet fills a rooftop water drum in 26 minutes, and a second inlet fills it in 39 minutes. With both inlets open, how many minutes will the empty drum take to fill?
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