Question: Andy wants to cross a river that is 1 kilometer wide and get to a point 4 kilometers downstream. (See Figure 2.) He can swim

Andy wants to cross a river that is 1 kilometer wide and get to a point 4 kilometers downstream. (See Figure 2.) He can swim at 4 kilometers per hour and run 10 kilometers per hour. Assuming that he begins by swimming and that he swims toward a point x kilometers downstream from his initial starting point A. how long will it take him to reach his destination D?

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