document.write( "Question 64909This question is from textbook Algebra 1
\n" ); document.write( ": At the same time Kris leaves Washington D.C.,for Detroit,Michigan,Amy leaves Detroit for Washington D.C. The distance between the cites is 510 miles.Amy's average speed is 5 miles per hour faster than Kris's. How fast is Kris's average speed if they pass each other in 6 hours? \n" ); document.write( "
Algebra.Com's Answer #45389 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
At the same time Kris leaves Washington D.C.,for Detroit,Michigan,Amy leaves Detroit for Washington D.C. The distance between the cites is 510 miles.Amy's average speed is 5 miles per hour faster than Kris's. How fast is Kris's average speed if they pass each other in 6 hours?
\n" ); document.write( "-----------------
\n" ); document.write( "Kris DATA:
\n" ); document.write( "time = 6 hrs ; distance = x miles ; rate= d/r = x/6 mph
\n" ); document.write( "-------------
\n" ); document.write( "Amy DATA:
\n" ); document.write( "time = 6 hrs ; distance = \"510-x\" miles ; rate = d/r = (510-x)/6
\n" ); document.write( "--------------
\n" ); document.write( "EQUATION:
\n" ); document.write( "Amy rate - Rick rate = 5 mph
\n" ); document.write( "(510-x)/6 - x/6 = 5
\n" ); document.write( "510-x - x = 30
\n" ); document.write( "-2x=-480
\n" ); document.write( "x=240 miles (Kris's distance)
\n" ); document.write( "Kris's rate = 240/6 = 40 mph
\n" ); document.write( "--------
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
\n" );