document.write( "Question 917706: A man divides his total journey into three equal parts and decides to travel the three parts with speeds 60 km / hr , 24 km / hr and 45 km /hr . Find the average speed during the whole journey ? \n" ); document.write( "
Algebra.Com's Answer #556776 by josgarithmetic(39620)\"\" \"About 
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Imprecise problem statement.
\n" ); document.write( "Is the trip cut into three equal parts by time, or by distance?\r
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\n" ); document.write( "\n" ); document.write( "Assuming the equal parts are by distance, let d be the distance of each part of the journey.
\n" ); document.write( "\"system%2860%2Ax=d%2C+24%2Ay=d%2C+45%2Az=d%29\"
\n" ); document.write( "\"system%28x=d%2F60%2C+y=d%2F24%2C+z=d%2F45%29\"
\n" ); document.write( "Total time is \"x%2By%2Bz=d%281%2F60%2B1%2F24%2B1%2F45%29\"\r
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\n" ); document.write( "\n" ); document.write( "The denominators: 2*2*3*5, 2*2*2*3, 3*3*5
\n" ); document.write( "LCD is 2*2*2*3*3*5=360\r
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\n" ); document.write( "\n" ); document.write( "Time is \"d%286%2F360%2B15%2F360%2B8%2F360%29=highlight_green%28d%2829%2F360%29%29\".\r
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\n" ); document.write( "\n" ); document.write( "Total distance is \"d%2Bd%2Bd=highlight_green%283d%29\".\r
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\n" ); document.write( "\n" ); document.write( "Question is, what is average speed for the journey.\r
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\n" ); document.write( "\n" ); document.write( "Decide if this is what you want.
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