document.write( "Question 1202302: Wormley ran to the store at 8 kilometers per hour and rode a bus home at 20 kilometers per hour. If his round trip traveling time was 7 hours, how many kilometers was it to the store? \n" ); document.write( "

Algebra.Com's Answer #837019 by math_helper(2461) $\"\"$ $\"About$

You can put this solution on YOUR website!


\n" );
document.write( "40km\r
\n" );
document.write( "\n" );
document.write( "----------\r
\n" );
document.write( "\n" );
document.write( "Workout:\r
\n" );
document.write( "\n" );
document.write( "8km/hr * t  = 20km/hr * (7-t)\r
\n" );
document.write( "\n" );
document.write( "8t = 140-20t  
\n" );
document.write( "28t = 140
\n" );
document.write( "t = 5 (hrs)  -->  Distance to store is 8km/hr*5hr = 40km\r
\n" );
document.write( "\n" );
document.write( "Check (using the bus speed):   20km/hr*(7hr-5hr) = 20km/hr*2hr = 40km  \n" );
document.write( "

\n" );