Respuesta :

Notice that the slope of the line is equal to the speed

[tex]\text{Slope (speed) = }\frac{y_2-y_1}{x_2-x_1}\text{ = }\frac{20\text{ -10}}{4\text{ - 2}}\text{ =}\frac{10}{2}=5\text{miles / hour}[/tex]

hence, the speed = 5 miles / hour