document.write( "Question 1072531: A boy covered 28km in 5 hours. He cycled part of the way at 11km/h and walked the rest of the way at 5km/h. How far did he walk? \n" ); document.write( "

Algebra.Com's Answer #687423 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "Let W be the distance (in kilometers) he walked.\r\n" );
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document.write( "Then the distance he cycled is (28-D) kilometers.\r\n" );
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document.write( "The time walking is  hours.\r\n" );
document.write( "The time he cycled is .\r\n" );
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document.write( "Your equation is\r\n" );
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document.write( " = 5.\r\n" );
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document.write( "To solve it, multiply both sides by 55 (LCD = 55). You will get\r\n" );
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document.write( "11W + 5*(28-W) = 5*55,\r\n" );
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document.write( "11W + 140 - 5W = 275,\r\n" );
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document.write( "6W = 275 - 140 = 135  --->  W =  = 22.5.\r\n" );
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document.write( "Answer.  He walked 22.5 kilometers.\r\n" );
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