I found the answer to this problem I'm doing online. I get all of what the guy is saying except for one part. Under his diagrams, why does he make x=40*h/9 to x=40h/3?
Link to problem:
http://www.chegg.com/homework-help/quest…
Link to problem:
http://www.chegg.com/homework-help/quest…
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It looks like a mistake. We all make them.