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Problem

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Textbook ExpertVerified Tutor
16 Nov 2021

Given information

An oil refinery is located on the north bank of a straight river that is  wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river  east of the refinery. The cost of laying pipe is  over land to a point  on the north bank and  under the river to the tanks.

Step-by-step explanation

Step 1.

According to the question, Draw the diagram of an oil refinery is located on the north bank of a straight river that is  wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river  east of the refinery. The cost of laying pipe is  over land to a point  on the north bank and  under the river to the tanks.

Using Pythagorean Theorem in right angled triangle        

  

   

     

Because length can’t be negative. 

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