Question
PSLE
A tank was filled with 54 litres of water at 12 00. Water flowed out of the tank from 12 00 to 16 00. The line graph shows the amount of water in the tank from 12 00 to 16 00. What was the average decrease in the volume of water in litres per hour from 12 00 to 16 00? (Give your answer in ℓ.)

1 m

Click button first when a symbol is required. X

PSLE
A tank was filled with 54 litres of water at 12 00. Water flowed out of the tank from 12 00 to 16 00. The line graph shows the amount of water in the tank from 12 00 to 16 00. What was the average decrease in the volume of water in litres per hour from 12 00 to 16 00? (Give your answer in ℓ.)