document.write( "Question 871890: I need to know the formula for this. Thanks!
\n" ); document.write( "Ann drove 60 kph and then 80 kph. The total distance is 540 km and took 8 hours, how far did she drive during 60 kph? \n" ); document.write( "
Algebra.Com's Answer #525790 by mananth(16946)\"\" \"About 
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First Part x km
\n" ); document.write( "Second Part -x 540 km
\n" ); document.write( "Total time 8 hours
\n" ); document.write( "First Part time 60 / x
\n" ); document.write( "Second Part time 80 / (- 540 - x)
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\n" ); document.write( "Time first part + time second part = 8 hours
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\n" ); document.write( "x/ 60 +( 540 -x)/ 80 = 8
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\n" ); document.write( "multiply the equation by the LCD
\n" ); document.write( "we get
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\n" ); document.write( "80 x+ 60 ( 540 -x)= 8 * 60 * 80
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\n" ); document.write( "80 x+ 32400 - 60 x = 38400
\n" ); document.write( "20 x+ 32400 = 38400
\n" ); document.write( "/ 20
\n" ); document.write( "4 x 1620 x+ = 1920
\n" ); document.write( "4 x = 1920 - 1620
\n" ); document.write( "4 x = 300
\n" ); document.write( " x= 75 km First part
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