- A80 min
- B30 min
- C48 min
- D120 min
Step-by-Step Solution
Net inflow = L/min. Time = min. (30 min ignores the outlet.)
Answer: A) 80 min
A 1,200-litre tank has an inlet that brings in 40 litres per minute and an outlet that drains 25 litres per minute. Starting empty with both open, how long does it take to fill?
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