- A7.6 h
- B2.4 h
- C3.6 h
- D6 h
Step-by-Step Solution
After 4 h, is left. Together per hour → h. (7.6 h is the total from the start.)
Answer: C) 3.6 h
A pipe fills a tank in 10 hours. After it has worked for 4 hours, a second pipe that fills the tank in 15 hours is also opened. How long do the two together take to finish?
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