document.write( "Question 759942: A truck heads north at a constant speed of 80 km/h. A car leaves 20 minutes
\n" ); document.write( "later heading north along the same road and travelling at a constant speed of
\n" ); document.write( "90 km/h.
\n" ); document.write( "
\n" ); document.write( "Write an equation that could be used to determine how much time in
\n" ); document.write( "hours, t, the car travels until it catches up to the truck. \r
\n" ); document.write( "\n" ); document.write( "**The correct answer is 90t = 80(t+1/3) , but I need help understanding why**
\n" ); document.write( "

Algebra.Com's Answer #462355 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
The truck travels for 1/3 hour plus some unknown time, t.
\n" ); document.write( "Twenty minutes is 1/3 hour.
\n" ); document.write( "This distance is \"80%2A%281%2F3%29%2B80%2At\" kilometers.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The car, starting from the same departure point, travels for time, t, and catches-up with the truck.
\n" ); document.write( "This distance is \"90%2At\" kilometers.
\n" ); document.write( "
\n" );