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Passing speed An automobile 20 feet long overtakes a truck 40 feet long that is traveling at $50 \mathrm{mi} / \mathrm{hr}$ (see the figure). At what constant speed...

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Passing speed An automobile 20 feet long overtakes a truck 40 feet long that is traveling at $50 \mathrm{mi} / \mathrm{hr}$ (see the figure). At what constant speed must the automobile travel in order to pass the truck in 5 seconds? (FIGURE CANNOT COPY)

Passing speed An automobile 20 feet long overtakes a truck 40 feet long that is traveling at $50 \mathrm{mi} / \mathrm{hr}$ (see the figure). At what constant speed must the automobile travel in order to pass the truck in 5 seconds? (FIGURE CANNOT COPY)

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