document.write( "Question 24149: Richard's average driving speed is 4 miles per hour faster than Kirk's. In the same lenght of time it takes Richard to drive 275 miles, Kirk only drives 255 miles. What is Richard's average driving speed? \n" ); document.write( "
Algebra.Com's Answer #12838 by Paul(988)\"\" \"About 
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255(x+4)=275x
\n" ); document.write( "255x+1020=275x
\n" ); document.write( "20x=1020
\n" ); document.write( "x=51\r
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\n" ); document.write( "\n" ); document.write( "51+4=55\r
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\n" ); document.write( "\n" ); document.write( "Hence, Richard's speed was 55mph and Kirk's speed was 51mph.
\n" ); document.write( "Paul.
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