document.write( "Question 948352: You must drive to an important meeting in a nearby city. If you were to drive at 90 miles an hour, you would arrive an hour early but if you drove at 30 miles an hour, you would arrive an hour late. At which (constant) speed should you drive so as to arrive exactly on time? \n" ); document.write( "
Algebra.Com's Answer #578851 by lwsshak3(11628)\"\" \"About 
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You must drive to an important meeting in a nearby city. If you were to drive at 90 miles an hour, you would arrive an hour early but if you drove at 30 miles an hour, you would arrive an hour late. At which (constant) speed should you drive so as to arrive exactly on time?
\n" ); document.write( "***
\n" ); document.write( "let x=distance traveled
\n" ); document.write( "travel time=distance/speed
\n" ); document.write( "\"x%2F30-x%2F90=2\"
\n" ); document.write( "lcd:90
\n" ); document.write( "3x-x=180
\n" ); document.write( "2x=180
\n" ); document.write( "x=90 miles
\n" ); document.write( "x/30=3 hrs (1-hr late)
\n" ); document.write( "x/90=1 hr (1-hr early)
\n" ); document.write( "To arrive exactly on time, travel time must be 2 hrs
\n" ); document.write( "90/2=45 mph
\n" ); document.write( "At which (constant) speed should you drive so as to arrive exactly on time? 45 mph \n" ); document.write( "
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