document.write( "Question 334085: what is the time that A will meet B if A walks at 80km/hr and B walks 60km/he and the total distance is 210km \n" ); document.write( "
Algebra.Com's Answer #239405 by jrfrunner(365)\"\" \"About 
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if they are to meet, the presumption (since not stated) is that they are walking toward each other.
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\n" ); document.write( "let \"d%5BA%5D\"=distance walked by A
\n" ); document.write( "let \"d%5BB%5D\"=distance walked by B
\n" ); document.write( "let \"r%5BA%5D\"=walking rate by A = 80 kmph
\n" ); document.write( "let \"r%5BB%5D\"=walking rate by B = 60 kmph
\n" ); document.write( "let t=time they meet
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\n" ); document.write( "you need to know the relationship: distance = rate*time: d=r*t
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\n" ); document.write( "given d=\"d%5BA%5D%2Bd%5BB%5D=210+km\"
\n" ); document.write( "d=\"r%5BA%5D%2At%2Br%5BB%5D%2At+\" (same t because they meet at a common time)
\n" ); document.write( "210=80*t+60*t=140*t
\n" ); document.write( "210/140=t
\n" ); document.write( "--
\n" ); document.write( "t=1.5 hours
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