- A7 1/5 hours
- B6 hours
- C30 hours
- D36 hours
Step-by-Step Solution
Net rate of the tank per hour, so 36 hours. 7 1/5 h wrongly adds the two rates.
Answer: D) 36 hours
A pipe can fill a tank in 12 hours. Another pipe can empty it in 18 hours. If both are opened, how long will it take to fill the tank?
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