document.write( "Question 243397: Three people run a mile. The first person runs the mile in seven minutes. The second person takes 5/4 as long as the first person. How many minutes did it take the third person to run the mile if the average for all three people is eight minutes?\r
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document.write( "A. 8 B. 8.25 C. 8.5 D. 9 E. 11.4 \n" );
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Algebra.Com's Answer #178365 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Three people run a mile. The first person runs the mile in seven minutes. \n" ); document.write( " The second person takes 5/4 as long as the first person. \n" ); document.write( "How many minutes did it take the third person to run the mile if the average for all three people is eight minutes? \n" ); document.write( ": \n" ); document.write( "Let t = time of the 3rd person \n" ); document.write( ": \n" ); document.write( "Change 5/4 to 1.25 \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( ": \n" ); document.write( "Multiply both sides by 3 \n" ); document.write( "15.75 + t = 24 \n" ); document.write( ": \n" ); document.write( "t = 24 - 15.75 \n" ); document.write( ": \n" ); document.write( "t = 8.25 min is the 3rd person's time \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check solution \n" ); document.write( " |