Question

Cheyenne drove 3000 miles in 75 hours. At this rate, how long will it take her to drive 4000 miles?

Answer 1

100 hours is your answer
3000/75=40mph
4000/40=100 hours

Answer 2

Set up a proportion:
$\frac{3000}{75}$=$\frac{4000}{x}$
To solve cross multiply:
3000x=300000
divide both sides by 3000:
3000x/3000=300000/3000
x=100

It will take her 100 hours to drive 4000 miles assuming she continues to travel at this rate.