A water tank at Amir's HDB flat is completely empty. Tap A fills the tank at 2.4 litres per minute. A drain valve removes water at 0.9 litres per minute. Both Tap A and the drain valve are opened at the same time. How many litres of water are in the tank after 5 minutes?
Show Worked Solution
Worked Solution
Step 1: Find the net rate of change.
Tap A fills at 2.4 L/min; drain removes at 0.9 L/min.
Net rate = 2.4 - 0.9 = 1.5 L/min
Step 2: Find total water after 5 minutes.
Volume = net rate x time = 1.5 x 5 = 7.5 litres
Answer: 7.5 litres
Correct answer: 7.5 litres
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