document.write( "Question 558685: a car and a truck is traveling north on a highway. the truck has a speed of 45 miles per hour and the car has a speed of 57 miles per hour. if the truck is ahead of the car, what is the relative velocity? \n" ); document.write( "
Algebra.Com's Answer #363153 by Edwin McCravy(20060)\"\" \"About 
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The car is catching up to the truck at a rate of 57-45 or 12 miles per hour.
\n" ); document.write( "The distance between them is shrinking at a rate of 12 miles per hour.
\n" ); document.write( "But since it's shrinking their relative velocity is -12 miles per hour.
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