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Problem 14 - Entrance Test

A tap fills a 600 L tank in 20 min. A second tap fills it in 30 min. How many minutes if both work together?

Correct: B

Rates: 600/20 = 30 L/min and 600/30 = 20 L/min. Combined 50 L/min → time = 600/50 = 12 min.