document.write( "Question 274878: Please help me with this problem.\r
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document.write( "Kim decides to run 2 Km in to the local gym\r
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document.write( "She runs the first x km at 8km/hr, then walks the rest at 4km/hr
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document.write( "Altogether the journey takes 20 minutes
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document.write( "Form and solve an equation to find the value of x \n" );
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Algebra.Com's Answer #200554 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Kim decides to run 2 Km in to the local gym \n" ); document.write( "She runs the first x km at 8km/hr, then walks the rest at 4km/hr \n" ); document.write( "Altogether the journey takes 20 minutes \n" ); document.write( "Form and solve an equation to find the value of x \n" ); document.write( ": \n" ); document.write( "change 20 min to \n" ); document.write( "x = dist ran (given) \n" ); document.write( "Then \n" ); document.write( "(2-x) = dist walked \n" ); document.write( ": \n" ); document.write( "Write a time equation, time = dist/speed \n" ); document.write( ": \n" ); document.write( "Run time + walk time = 1/3 hr \n" ); document.write( " \n" ); document.write( "Multiply by 24 to rid us of those denominators, results \n" ); document.write( "3x + 6(2-x) = 8 \n" ); document.write( ": \n" ); document.write( "3x + 12 - 6x = 8 \n" ); document.write( ": \n" ); document.write( "3x - 6x = 8 - 12 \n" ); document.write( ": \n" ); document.write( "-3x = -4 \n" ); document.write( "x = \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Is this true, walk dist = 2/3 km, find the times using decimals \n" ); document.write( "1.33/8 + .67/4 = \n" ); document.write( ".166 + .1675 = .333 hr, which is 20 min \n" ); document.write( " \n" ); document.write( " |