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Unformatted text preview: The total amount invested in bonds is 10,0002,500=7,500. A motor boat heads upstream a distance of 50 miles on Fraser River, whose current is running at 4 miles per hour. The trip up and back takes 6 hours. Assuming that the motorboat maintained a constant speed relative to the water, what was its speed? Denote v velocity of the boat. Velocity mph Distance miles Time= Dist./Vel. Upstream v4 50 50/( v4) Downstream v+ 4 50 50/( v +4) Set up a table. The total time traveled is 6 hours. We get: Solve this for v. Solve by using a quadratic formula. The negative answer does not make sense, so we have the velocity: Check. So it takes 3.68 hours upstream and 2.32 hours downstream. That is a total of 6 hours....
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This note was uploaded on 12/17/2010 for the course MATH 131 taught by Professor Staff during the Fall '08 term at UNC.
 Fall '08
 Staff
 Equations

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