- A2 h
- B6 h
- C4.5 h
- D4 h
Step-by-Step Solution
In 2 h: . The second pipe takes 4 h; together per hour, so takes 2 h. Total 4 h. (2 h is only the second stage.)
Answer: D) 4 h
A pipe can fill a tank in 8 hours. After it runs for 2 hours, a second pipe with twice its rate is also opened. How long does the tank take to fill altogether?
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