A hunter is at a point along a river bank. He wants to get to his cabin, located 3 miles north and 7 miles west. (See figure.) He can travel 5 mph along the river but only 2 mph on the rocky land. How far upriver should he go in order to reach the cabin in minimum time? 3 The distance that the hunter should walk along the river is approximately mi. (Do not round until the final answer. Then round to the nearest tenth as needed.)

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