An island is 1.5 mi due north of its closest point on a straight shoreline. a visitor staying at a cabin on the shore that is 5.6 mi from that point. the visitor is planning to go from the cabin to the island. suppose that the visitor runs at a rate of 5 mph and swims at a rate of 1 mph. how far should the visitor run before swimming to minimize the time it takes to reach the island?