An oil refinery is located on the north bank of a straight river that is2km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river3km east of the refinery. The cost of laying pipe is$200,000/km over land to a pointPon 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 shouldPbe located? (Round your answer to two decimal places.)