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At noon a sailboat is 20 km south of a freighter. The sailboat is traveling east at 20 km per hour, and the freighter is

At noon a sailboat is 20 km south of a freighter. The sailboat is traveling east at 20 km per hour, and the freighter is traveling south at 40 km per hour.

a. When is the distance between the boats a minimum?

b. If the visibility is 10 km, could the people see each other?

c. At what rate is the distance between the two boats changing at that instant?

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