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I have posted a link there to this thread so the OP can view my work.Calc - Optimization? Confusing question...?

I don't understand what this question is asking:

A pipeline needs to be connect from a powerhouse to an island. The island is 5 km away from the nearest point, A on a straight shore line. The powerhouse is 13 km away from point A. If it costs 1.4 times as much to lay the pipeline underwater as it does over land, how should the pipe be laid to minimize the cost?

The ans is 5.1 km from A.

What is this question asking me? I'm so confused.

How would I approach this?