A power house, P, is on one bank of a straight river W meters wide, and a factory, F, is on the opposite bank L meters downstream from P. The cable has to be taken across the river, under water at a cost of $CW/m. On land the cost is $CL/m. What is the minimum cost?
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Armando Longobardi Mehdi Dehghan Hoang Minh Tri 萌

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