An oil refinery is located 1 km north of a straight river that is 2 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 6 km east of the refinery. The cost of laying pipe is $400.00/km over land to a point P on the north bank and $800.00/km under the river to the tanks. To minimize the cost of the pipeline, where should P be located?   please solve for x

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