RATES Problem

*Subject*: RATES Problem*From*: DCRUZ%T9ACC1 at sc.intel.com*Date*: Tue, 29 Aug 89 21:59:25 -0500*Apparently-to*: mathgroup-out at yoda.ncsa.uiuc.edu

Hi, I've just been added to the mathematica mailing list. I've problem setting the equation for this one. This is a MAXIMA-MINIMA problem. The cost of fuel per hour for running a ship is proportional to the cube of the speed and is $ 27 per hour when the speed is 12 miles per hour. Other costs amounts to $ 128 per hour regardless of the speed. Express the cost per mile as a function of the speed, & find the speed that makes the cost minimum. The equation I was able to set up was: C = V^3 + 128 But from there I don't know how to go about getting the $ 27 per hr when V=12 miles per hour into the system of equations. Could someone please help me solve this problem and also pls elaborate on how to think through problems like these. Take care & thanks to all Dave Cruz dcruz at t9acc1.intel.com