A 600-litre tank has two inlets delivering 12 and 8 litres per minute and an outlet C. With all three open, the empty tank fills in 50 minutes. How long would C alone take to empty the full tank?
Correct answer C. 75 minutes
Explanation
Net rate = 600 / 50 = 12 litres per minute, so C drains 12 + 8 − 12 = 8 litres per minute. C empties 600 litres in 75 minutes.
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