document.write( "Question 1171220: A delivery truck follows a regular route that is 270 km. One day the driver begins the route half hour late. In order to finish on time, she drives the truck 6km/hr faster than usual. What is the truck's usual speed \n" ); document.write( "
Algebra.Com's Answer #796146 by josgarithmetic(39620)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "             SPEED         TIME         DISTANCE\r\n" );
document.write( "\r\n" );
document.write( "NORMAL          r          270/r         270\r\n" );
document.write( "\r\n" );
document.write( "LATE          r+6          270/(r+6)      270\r\n" );
document.write( "\r\n" );
document.write( "DIFFERENCE                  1/2\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( "\"270%2Fr-270%2F%28r%2B6%29=1%2F2\"-------solve for r. \n" ); document.write( "
\n" );