document.write( "Question 1044407: Jessica drove to her cabin on the lake and back. it took one hour longer to go there then it did to come back. The average speed on the trip was 50 km/h. The average speed on the way back was 75 km/h. how many hours to the trip there take? \n" ); document.write( "

Algebra.Com's Answer #659694 by josgarithmetic(39620) $\"\"$ $\"About$

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document.write( "                  SPEED        TIME        DISTANCE\r\n" );
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document.write( "Going there         r           t+1          d\r\n" );
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document.write( "Coming back         75           t           d\r\n" );
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document.write( "Total                         (t+1)+t        2d\r\n" );
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document.write( "AVERAGE            50\r\n" );
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\n" ); document.write( "\n" ); document.write( "Three unknown variables. Basic rule RT=D for travel rates.\r
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\n" ); document.write( "\n" ); document.write( " $\"system%28r%28t%2B1%29=d%2C75t=d%2C2d%2F%28t%2B%28t%2B1%29%29=50%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "You can solve for all three variables, but the question asks for solution and value of $\"%28t%2B1%29%2Bt\"$ , the time for the whole trip , as round-trip. \n" ); document.write( "

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