An oil refinery is located on the north bank of a straight river that is 2 km wide. A pipeline is to be constructed from the ref
inery to storage tanks located on the south bank of the river 10 km east of the refinery. The cost of laying pipe is$200,000/km over land to a point P on the north bank and $400,000/km under the river to the tanks. To minimize the cost of the pipeline, how far from the refinery should P be located? (Round your answer to two decimal places.)
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Here's the equation,please do ask if you don't understand. Sorry for my terrible hand writing ^^; hope it helps!
