A pump fills a tank of capacity 360 litres in 12 minutes when working alone. A second pump fills the same tank in 20 minutes when working alone. If both pumps work together, how long will it take to fill the tank?
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Worked Solution
Step 1: Rate of pump 1 = 360 ÷ 12 = 30 litres/min.
Step 2: Rate of pump 2 = 360 ÷ 20 = 18 litres/min.
Step 3: Combined rate = 30 + 18 = 48 litres/min.
Step 4: Time = 360 ÷ 48 = 7.5 minutes.
Answer: 7.5 min
Correct answer: 7.5 min
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