?Consider the situation in Exercise 57 if the cost of laying pipe under the river is
Chapter 4, Problem 72(choose chapter or problem)
Consider the situation in Exercise 57 if the cost of laying pipe under the river is considerably higher than the cost of laying pipe over land ($400,000/km). You may suspect that in some instances, the minimum distance possible under the river should be used, and š should be located 6 km from the refinery, directly across from the storage tanks. Show that this is never the case, no matter what the āunder riverā cost is.
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