document.write( "Question 741233: if a car travelled 5 kilometers an hour faster it would take an hours less to travel 210 km,what is the original speed of the car and what time does it take? \n" ); document.write( "

Algebra.Com's Answer #451916 by mananth(16946) $\"\"$ $\"About$

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d=210
\n" ); document.write( "original speed=x
\n" ); document.write( "increased speed = x+5\r
\n" ); document.write( "\n" ); document.write( "Time original -time with increased speed = 1\r
\n" ); document.write( "\n" ); document.write( "t=d/r\r
\n" ); document.write( "\n" ); document.write( " $\"210%2Fx-210%2F%28x%2B5%29+=1\"$ \r
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\n" ); document.write( "\n" ); document.write( "simplify\r
\n" ); document.write( "\n" ); document.write( "multiply equation by x(x+5)
\n" ); document.write( "210(x+5)-210x=x(x+5)\r
\n" ); document.write( "\n" ); document.write( "210x+1050-210x=x^2+5x\r
\n" ); document.write( "\n" ); document.write( "x^2+5x-1050=0\r
\n" ); document.write( "\n" ); document.write( "x^2+35x-30x-1050=0\r
\n" ); document.write( "\n" ); document.write( "x(x+35)-30(x+35)=0\r
\n" ); document.write( "\n" ); document.write( "(x-30)(x+35)=0\r
\n" ); document.write( "\n" ); document.write( "x= 30 OR -35\r
\n" ); document.write( "\n" ); document.write( "ignore negative\r
\n" ); document.write( "\n" ); document.write( "There you are\r
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