Points A and B are opposite each other on shores of a straight river 3km wide. Point C is on the same shore as B but 2km down the river from B. A telephone company wishes to lay a cable from A to C. If the cost per kilometer of the cable is 25% more under the water than it is on land, what line of cable would be least expensive for the company? (Let c dollars be the cost per kilometer on land.)
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Points A and B are opposite each other on shores of a straight river 3km wide. Point C is on the same shore as B but 2km down the river from B. A telephone company wishes to lay a cable from A to C. If the cost per kilometer of the cable is 25% more under the water than it is on land, what line of cable would
be least expensive for the company? (Let c dollars be the cost per kilometer on land.)
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