document.write( "Question 890987: A man drives from Ibadan to Oyo, a distance of 48km, in 45 minutes. If he drives at 72km/h where the surface is good and 48km/h where it is bad, find the number of kilometres of good surface. \n" ); document.write( "

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A man drives from Ibadan to Oyo, a distance of 48km, in 45 minutes. If he drives at 72km/h where the surface is good and 48km/h where it is bad, find the number of kilometres of good surface.
\n" ); document.write( "***
\n" ); document.write( "let x=length of good surface (distance)
\n" ); document.write( "48-x=length of bad surface (distance)
\n" ); document.write( "travel time=distance/speed
\n" ); document.write( "..
\n" ); document.write( " $\"x%2F72%2B%2848-x%29%2F48=45%2F60\"$
\n" ); document.write( " $\"x%2F72%2B%2848-x%29%2F48=3%2F4\"$
\n" ); document.write( "lcd:288
\n" ); document.write( "4x+6(48-x)=216
\n" ); document.write( "4x-288-6x=216
\n" ); document.write( "2x=72
\n" ); document.write( "x=36
\n" ); document.write( "48-36=12
\n" ); document.write( "number of kilometres of good surface=36 \n" ); document.write( "

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