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There were 45 liters of water in a tank at 08:00. What flow out of the tank from 08:00 to 10:00 as shown in the line graph below. On the average, what is the rate of water that flowed out of the tank?

Question Image of There were 45 liters of water in a tank at 08:00. What flow out of the tank from 08:00 to 10:00 as shown in the line graph below. On the average, what is the rate of water that flowed out of the tank?.
A
7.8
B
9.75
C
19.5
D
22.5
E
None of the above