document.write( "Question 455066: two cars leave from the same location, one heading North at 30mph and the other heading East at 40mph. How fast is the distance between them increasing when the cars have traveled 5 hours? \n" ); document.write( "
Algebra.Com's Answer #312421 by Alan3354(69443)\"\" \"About 
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The rate of change of the distance is constant.
\n" ); document.write( "\"r%5E2+=+30%5E2+%2B+40%5E2\"
\n" ); document.write( "r = 50 mph
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