Question

Pls help me with this one

Answer 1

`v\ge52.5 mph`

Explanation:

`s=420m\\ t=8h\\ v=?\\  t\ge \frac sv \\ 8\ge \frac{420}v \ \ \ \ |\cdot v\\ 8v\ge 420\ \ \ |:8\\ v\ge \frac{420}8\ \to \ v\ge 52.5 mph`

Answer 2

8x>420

x> or =52.5

52.5 mph average speed

easy stuff kid