Posted by **Ryan** on Wednesday, May 8, 2013 at 1:25am.

15. Given ensuing information, determine the least cost and the least cost mix of on-

and off-shore pipe.

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•

•

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The intake facility is in the water 2 miles vertically north of the shoreline

The water filtration plant is on land 1 mile vertically south of the shoreline

The intake and the plant are horizontally 3 miles apart

The cost to lay pipe off-shore is $60,000 per mile and the cost to lay pipe on-

shore is $30,000 per mile

The shoreline runs east and west in a horizontal straight line

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- calc -
**Steve**, Wednesday, May 8, 2013 at 10:55am
If the pipe comes ashore x miles from the point directly south of the intake, the cost (in $K) is

c(x) = 60√(x^2+4) + 30√((3-x)^2 + 1)

dc/dx = 60x/√(x^2+4) - 30(3-x)/√((3-x)^2 + 1)

dc/dx=0 when x=1

So, we have √5 miles of offshore pipe and √5 miles of onshore pipe.

Cost = 90√5 $K = $201,246.12

- calc -
**James**, Wednesday, May 8, 2013 at 8:35pm
can you tell me how you got √(x^2+4) and √((3-x)^2 + 1)

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