document.write( "Question 257225: chris drove to a friends house at a rate of 40 mi/h. he returned by the same route at a rate of 45 mi/h, the driving time fro the round trip was 4 h, whats the total distance chris travled? \n" ); document.write( "

Algebra.Com's Answer #189147 by drk(1908) $\"\"$ $\"About$

You can put this solution on YOUR website!
This is an RTD problem. Here is the table based on the given information:
\n" ); document.write( "speeds . . . . . . . . . rate . . . . . . . . . . . .time . . . . . . . . . . . .distance
\n" ); document.write( "A . . . . . . . . . . . . . . 40 . . . . . . . . . . . . x . . . . . . . .. . . . . . .. . 40x
\n" ); document.write( "B . . . . . . . . . . . . . . 45 . . . . . . . . . . . . 4-x . . . . . . . . . . . . . . 180 - 45x
\n" ); document.write( "average . . . . . . . . . . . . .. . . . . . . . . . .. 4 . . . . . . . .. . . . . .. . . . .
\n" ); document.write( "The distances must be equal, so
\n" ); document.write( " $\"40x+=+180+-45x\"$
\n" ); document.write( " $\"85x+=+180\"$
\n" ); document.write( " $\"x+=+2.11764706\"$
\n" ); document.write( "The distance is: ~ 84.71 miles \n" ); document.write( "

\n" );