We know the rate is 56 miles per hour. We should make an equation for this problem.
56x=y
X is the amount of hours while y is the total amount of miles.
This the the equation we're trying to find:
56x=672
To find what x is, we need to divide 672 by 56.
672÷56
12
So, it will take 12 hours for Chad to drive 672 miles.