How many minutes does it take a car traveling 60 mph to travel a distance of 400miles?

The basic formula for these kinds of questions is "Rate X Time = Distance". In this case you know the distance and the rate, so you want to solve for time (i.e. "How long") so the first step is to rewrite the equation so it's solving for time instead of distance.

If you divide (the opposite of multiply since the left side of the equation is multiplying by Rate) both sides by R (i.e. Rate) the new version of the equation becomes

T = Distance/Rate

Now replace the variables you know (from the original story problem).

T = 400/60

T = 6.6666 hours

There are 60 minutes in an hour so...

6.6666 X 60 = 399.6 minutes