document.write( "Question 386978: Sally travels all the way from her house to the library. The library is 3 km from her house and it takes half an hour to arrive there. Sally first walks 5 km/h, and then runs 10 km/h later. How long did Sally walk before she ran? \n" ); document.write( "
Algebra.Com's Answer #273501 by mananth(16946)\"\" \"About 
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Sally travels all the way from her house to the library. The library is 3 km from her house and it takes half an hour to arrive there. Sally first walks 5 km/h, and then runs 10 km/h later. How long did Sally walk before she ran?
\n" ); document.write( "...
\n" ); document.write( "let her walk x km
\n" ); document.write( "she will run 3-x km
\n" ); document.write( "...
\n" ); document.write( "t=d/r
\n" ); document.write( "..
\n" ); document.write( "time walk +time run = total time
\n" ); document.write( "x/5 + (3-x)/10 = 1/2
\n" ); document.write( "LCD =10
\n" ); document.write( "(2x+(3-x))/10=1/2
\n" ); document.write( "(2x+3-x)/10=1/2
\n" ); document.write( "(x+3)/10=1/2
\n" ); document.write( "cross multiply
\n" ); document.write( "2(x+3)=10
\n" ); document.write( "2x+6 = 10
\n" ); document.write( "-6 -6
\n" ); document.write( "2x=4
\n" ); document.write( "/2
\n" ); document.write( "x=2 the km she walked
\n" ); document.write( "....
\n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( "
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