document.write( "Question 676354: A car travels from town a to town b going 30 mph, on the trip back, its averaging 45 mph? How far is it between towns if the whole trip took 9 hours? \n" ); document.write( "

Algebra.Com's Answer #420304 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A car travels from town a to town b going 30 mph, on the trip back, its averaging 45 mph?
\n" ); document.write( "How far is it between towns if the whole trip took 9 hours?
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\n" ); document.write( "Let d = dist from town a to b
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\n" ); document.write( "Write a time equation, time = dist/speed
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\n" ); document.write( "To time + return time = 9 hrs
\n" ); document.write( " $\"d%2F30\"$ + $\"d%2F45\"$ = 9
\n" ); document.write( "multiply by 90 to rid us of the denominators
\n" ); document.write( "3d + 2d = 90(9)
\n" ); document.write( "5d = 810
\n" ); document.write( "d = 162 miles from town a to b
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\n" ); document.write( "Confirm this by finding the time each way
\n" ); document.write( "162/30 = 5.4 hrs
\n" ); document.write( "162/45 = 3.6 hrs
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\n" ); document.write( "total = 9 hrs
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