- A13 h
- B15 h
- C12 h
- D
Step-by-Step Solution
In 120ths: A 6, . 10 h at 7 gives 70. Then give 10 per hour; 50 more takes 5 h. Total 15 h h keeps open.)
Answer: B) 15 h
Pipe A fills a tank in 20 hours and pipe B in 30 hours, while pipe C empties it in 40 hours. All three are opened on the empty tank, and C is closed after 10 hours. How long does the tank take to fill in all?
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