How fast are the quicks driving?

Question

the quicks are leaving their home to go on vacation. after driving for 3.25 hours, they are 150 km from their home. then, after 4.75 hours they are 250 km from their home. how fast are the quicks driving?

Answer 1

total distance=rate*total time

Answer 2

we can set it as a slope question.

3.25,150

4.75 , 250

difference of the two y's is 250-150=100

difference of the two x's is 4.75-3.25=1.5

100/1.5

equals 66.67 miles per hour