The speed is defined as the ratio between the distance you cover and the time it takes you to cover that distance.
So, in this case, we have
[tex]s = \dfrac{3.5}{0.5} = \dfrac{28}{4} = \dfrac{56}{8} = 7\text{ mph}[/tex]
to find james’ constant rate of speed, you can divide miles by hours (m/h)
28 miles / 4 hours = 7
56 miles / 8 hours = 7
3.5 is half of 7, so we know that’s true as well
this means james’ constant rate of speed would be 7 mph
