February 27, 2017

Homework Help: Calculus

Posted by Ass10 on Monday, November 14, 2011 at 3:17pm.

You are the owner of a delivery company with one truck. The trucks fuel economy is 1200/x miles per gallon when driving at x miles per hour (where 80 >= x <= 110). The price of fuel is $1 per gallon. You pay the truck driver $8 per hour.
If a delivery 100 miles away is planned, at what speed between 80 and 110 mph should the truck to drive to minimize the cost of the trip?

I'm having trouble finding the equation to differentiate.
Please show work.

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