Question
PSLE
A tank contained 20 litres of water at 18 00. A tap was turned on and water flowed into the tank from 18 00 to 22 00. The line graph shows the amount of water in the tank from 18 00 to 22 00. What was the average increase in the volume of water in litres per hour from 18 00 to 22 00? (Give your answer in ℓ.)

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PSLE
A tank contained 20 litres of water at 18 00. A tap was turned on and water flowed into the tank from 18 00 to 22 00. The line graph shows the amount of water in the tank from 18 00 to 22 00. What was the average increase in the volume of water in litres per hour from 18 00 to 22 00? (Give your answer in ℓ.)