An oil refinery is located 1 km north of the north bank of a straight river that

Question

An oil refinery is located 1 km north of the north bank 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 $400,000/km over land to a point P on the north bank and $800,000/km under the river to the tanks. To minimize the cost of the pipeline, how far downriver from the refinery should the point P be located? (Round your answer to two decimal places.)

Explanation / Answer

Plese visit this link...though its big link please copy it and paste it on your browser..The answer to your question is very beautifully given as the solution to question 47.....it is the same question that you've posted https://docs.google.com/viewer?a=v&q=cache:sF04NXrBHboJ:fac-staff.seattleu.edu/difranco/web/Math_134_Fall_2011/4.7Solutions.pdf+An+oil+refinery+is+located+1+km+north+of+the+north+bank+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+%24400,000/km+over+land+to+a+point+P+on+the+nor&hl=en&gl=in&pid=bl&srcid=ADGEESgKNwjzN-kXxdQxSY3ZxA_9uXgB99zwxMbRPGPvfWb1i__ZP5wyB8GVLlG9ZkZ52sSCqYxS7_whBocpfgcTcb92Vupq9Y9gjT-G8gb9zX97XhaJYSgOZxaZW7SOgWICKZdZSSZC&sig=AHIEtbRj5WjGaEDyMwxpkR_VQ0BQXJJsjw

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