ratio
posted by Celest .
if a driver drives 40 miles in an hour, what is his ratio of miles to minutes, in lowest terms?
Is the answer 40:60?

You're partly right. Now you have to reduce this to lowest terms.
40:60 = 4:6 = 2:3 
At the same speed, how long would it take the driver to travel 60 miles? how would I find that answer?

One way to solve this is with a proportion.
Cross multiply and solve for x.
40/60 = 60/x
40x = 3600
x = 90 minutes = 1 1/2 hours 
hmk