40 miles per hour means that you will go 40 miles in one hour
Travelling at this speed, we can reason that we can travel 80 miles in two hours
We can also travel 20 miles in a 1/2 (half) hour, since 20 is half of 40
So the answer is between 1 and 2 hours
Since 40 miles + 20 miles = 60 miles, it should take us 1 hour + 1/2 hour = 3/2 hours, or 1.5 hours since we're traveling at the same speed the entire time
