Find the Speed V, in Miles Per Hour, That Will $C = \frac { v ^ { 2 } } { 800 }$

question 72

Multiple Choice

Find the speed v, in miles per hour, that will minimize costs on a 125-mile delivery trip. The cost per hour for fuel is $C = \frac { v ^ { 2 } } { 800 }$ dollars, and the driver is paid $W = \$ 8$ dollars per hour. (Assume there are no costs other than wages and fuel.)

• A)675 mph
• B)125 mph
• C)800 mph
• D)80 mph
• E)40 mph

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