document.write( "Question 329399: Maria drove to her grandmother’s house at an average speed of 60 miles per hour. On the way home, she averaged only 45 miles per hour due to traffic. If she spent a total of 3 1/2 hours driving, how many miles is the trip to her grandmother’s house? \n" ); document.write( "

Algebra.Com's Answer #236068 by Fombitz(32388) $\"\"$ $\"About$

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Rate*Time=Distance
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\n" ); document.write( " $\"60%2AT1=D\"$
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\n" ); document.write( " $\"45%2AT2=D\"$
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\n" ); document.write( " $\"60T1=45T2\"$
\n" ); document.write( " $\"4T1=3T2\"$
\n" ); document.write( "1. $\"T1=%283%2F4%29T2\"$
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\n" ); document.write( "2. $\"T1%2BT2=3.5\"$
\n" ); document.write( "Subsitute eq. 1 into eq. 2,
\n" ); document.write( " $\"%283%2F4%29T2%2BT2=3.5\"$
\n" ); document.write( " $\"%287%2F4%29T2=3.5\"$
\n" ); document.write( " $\"T2=3.5%284%2F3%29\"$
\n" ); document.write( "Then from above,
\n" ); document.write( " $\"D=45%2AT2\"$
\n" ); document.write( " $\"D=45%284%2F3%29%283.5%29\"$
\n" ); document.write( " $\"highlight%28D=210%29\"$ miles \n" ); document.write( "

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