book Maths Puzzle Numerical Ability

It takes Tom 4 hours to buid a fence. If he hires Jack to help him, together they can do the job in just 3 hours. If Jack built the same fence alone, how long would it take him?

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A local chicken farmer is constructing a set of eight pens to cage his chickens as shown in the diagram below. He has decided to use 1200 feet of fencing to create the width of a rectangle is 3 inches less than its length. the area of the rectangle is 340 square inches. what are the length and width of the rectangle?
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