document.write( "Question 676545: A boy runs one k.m. in 12 min. How long will he take to runs 400 m? \n" ); document.write( "
Algebra.Com's Answer #420391 by MathLover1(20855)\"\" \"About 
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A boy runs \"v=1km%2F12min=1000m%2F12min\" \r
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\n" ); document.write( "\n" ); document.write( "\"d=v%2At\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=d%2Fv\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=400m%2F%281000m%2F12min%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=%28400m%2A12min%29%2F1000m\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=%282%2A12min%29%2F5\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=24min%2F5\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=4.8min\"\r
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