book Maths Puzzle Numerical Ability

I dont understand how to solve a problem that states : Find the area of a rectangle with L=2x+3 and W = x-2

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book Other Question

When wire is selling at $.0125 a foot, how many feet can you buy for a dollar? Two cars leave town at the same time and heading in the same direction. The first car travels 45mph and the second car travels 53mph. In how many hours will the second car be 30 miles ahead of the first?