So tired and upset right now. Please, anyone?

The graph below shows the distance (y) in kilometers of two cars from their destination at different times (x) in minutes. The table shows the values plotted on the graph.

Time
(in minutes)
x 0 10 20 30 40 50
Car 1
(in km)
y 50 40 30 20 10 0
Car 2
(in km)
y 50 40.85365 33.3804 27.2742 22.285 18.2085

Part D: What is the average rate of change from x = 20 to x = 40 for the function representing the motion for car 2? What does the value of this average rate of change reepresent?

Question

So tired and upset right now. Please, anyone?

The graph below shows the distance (y) in kilometers of two cars from their destination at different times (x) in minutes. The table shows the values plotted on the graph.

Time
(in minutes)
x	0	10	20	30	40	50
Car 1
(in km)
y	50	40	30	20	10	0
Car 2
(in km)
y	50	40.85365	33.3804	27.2742	22.285	18.2085

Part D: What is the average rate of change from x = 20 to x = 40 for the function representing the motion for car 2? What does the value of this average rate of change reepresent?