document.write( "Question 285014: a car 15 feet long overtakes a truck 30 feet long which is traveling at the rate of 45 miles per hour. how fast must the car travel to pass the truck in 3 seconds? \n" ); document.write( "
Algebra.Com's Answer #206684 by mananth(16946)\"\" \"About 
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Let the speed of the car be x feet/sec\r
\n" ); document.write( "\n" ); document.write( "Truck speed = 45 mph\r
\n" ); document.write( "\n" ); document.write( "The effective speed of the car is x-45 mph ( because they are in the same direction)\r
\n" ); document.write( "\n" ); document.write( "The car has to travel 15feet +30 feet to completely pass the truck = 45 feet\r
\n" ); document.write( "\n" ); document.write( "45 mph =66 ft/sec\r
\n" ); document.write( "\n" ); document.write( "Speed = distance / time\r
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\n" ); document.write( "\n" ); document.write( "x-66 = 45 / 3\r
\n" ); document.write( "\n" ); document.write( "x-66=15\r
\n" ); document.write( "\n" ); document.write( "x=66+15\r
\n" ); document.write( "\n" ); document.write( "x= 81 ft/sec\r
\n" ); document.write( "\n" ); document.write( "=55 mph\r
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