document.write( "Question 335532: On a weekend trip you average 35 miles per hour in the city and 60 miles per hour on the highway. If the 150 mile trip took 3 hours how much of the time were you droning in the city \n" ); document.write( "

Algebra.Com's Answer #240634 by Fombitz(32388) $\"\"$ $\"About$

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Rate*Time=Distance
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\n" ); document.write( "In the city,
\n" ); document.write( " $\"35%2AT1=D1\"$
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\n" ); document.write( "On the highway,
\n" ); document.write( " $\"60%2AT2=D2\"$
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\n" ); document.write( " $\"D1%2BD2=150\"$
\n" ); document.write( "1. $\"35T1%2B60T2=150\"$
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\n" ); document.write( "2. $\"T1%2BT2=3\"$
\n" ); document.write( "From eq. 2,
\n" ); document.write( " $\"T2=3-T1\"$
\n" ); document.write( "Substitute into eq. 1,
\n" ); document.write( " $\"35T1%2B60%283-T1%29=150\"$
\n" ); document.write( " $\"35T1%2B180-60T1=150\"$
\n" ); document.write( " $\"-25T1=-30\"$
\n" ); document.write( " $\"T1=6%2F5\"$ hr
\n" ); document.write( " $\"T1=%286%2F5%29%2860%29=72\"$ minutes \n" ); document.write( "

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