The following is the graph of average trip speed for a car on a road trip. average trip speed (miles per hour) 80+ 76 72 68 64 60 56 52 48 44 40 36 32 28 24 20 16 12 8 4 4.5 5 5.5 6 6.5 7 75 8 8.5 9 9.5 10 time (hours) What is the car's average speed from t=1 to t=5.5 hours? miles per hour Do not include units in the answer blank, just a number. If rounding is necessary, round to 2 digits after the decimal. 0.5 1 1.5 2 2.5 3 3.5 4 ANSWER: