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I have posted a link there to this topic so the OP can see my work.Function Math Question?

I am having a problem solving this question, any help is appreciated!

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 refinery to a point P on the south bank of the river, and then along the river to storage tanks on the south side of the river 6 km east of the refinery. The cost of laying pipe is $400,000 per km over land, and $800,000 per km under the river. Express the total cost of the pipeline as a function of the distance from P to the storage tanks.