Question
PSLE
A tank was filled with 58 litres of water at 18 00. Water flowed out of 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 decrease 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 was filled with 58 litres of water at 18 00. Water flowed out of 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 decrease in the volume of water in litres per hour from 18 00 to 22 00? (Give your answer in ℓ.)