exam Maths Puzzle Numerical Ability

I am going to take a final exam and i need help to making a study guide that i can understand how to do the following so i won't forget. I need someone who has a couple of minutes

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exam Other Question

Mitchel drove to a friend at a rate of 40 miles/hr. He returned by the same route at a rate of 45 miles/hr.The driving time for the round trip was 4 hours.What is the distance Mitchel travelled ? Multiply, using the vertical method
(mē-5mn+3nē)(mē+4mn-2nē)