Exercise 4.7.3 Suppose the island is 1𝑚𝑖 from shore, and the distance from the cabin to the point on the shore closest to the island is 15𝑚𝑖.
Suppose a visitor swims at the rate of 2.5𝑚𝑝ℎ and runs at a rate of 6𝑚𝑝ℎ.
Let 𝑥 denote the distance the visitor will run before swimming, and find a function for the time it takes the visitor to get from the cabin to the island. 𝑇(𝑥)=
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