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4) Shauna enters a bike race. She checks out the course one weekend and it takes her a full hour to ride the course. If she rides at an average rate of 18 mph for the first 20 minutes, speeds up to 25 mph for the next 10 minutes, slows to 12 mph for the next 20 minutes and finishes with a speed of 28 mph, how long is the course? Express your answer to the nearest tenth of a mile.
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5) Mr Green is building a raised bed planter box frame 14
ft. long, 10 ft. wide, and 3 ft. high as shown. The top is 2
feet across from inner edge to outer edge so that Mr. Green
can sit down comfortably. Mr. Green plans to treat all the
surfaces, including the bottom, with a weather resistant
chemical. What is the surface area of the entire frame so
that he will know how much chemical to purchase?
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