Question
PSLE
A tank was filled with 60 litres of water at 09 00. Water flowed out of the tank from 09 00 to 13 00. The line graph shows the amount of water in the tank from 09 00 to 13 00. What was the average decrease in the volume of water in litres per hour from 09 00 to 13 00? (Give your answer in ℓ.)

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PSLE
A tank was filled with 60 litres of water at 09 00. Water flowed out of the tank from 09 00 to 13 00. The line graph shows the amount of water in the tank from 09 00 to 13 00. What was the average decrease in the volume of water in litres per hour from 09 00 to 13 00? (Give your answer in ℓ.)