Question

Kayla was driving from Philadelphia to Florida, trying to remain at a constant speed as much as possible after she reached the highway. She travelled 139.5 miles after an hour and a half and then 395 miles after 5 hours. Which represents Kayla's speed (rate of change)?

Answer 1

Explanation:

Speed = change in distance/change in time

S= Δd/Δt

let d1 = 139.5miles

d2 = 395miles

t1 = 1.5 hrs

t2 = 5hrs

Δd = d2-d1

Δd = 395-139.5

Δd = 255.5miles

Δt = 5-1.5

Δt = 3.5hrs

Speed = 255.5/3.5

Speed = 73miles/hr

Hence Kayla's speed is 73miles/hour