document.write( "Question 717539: if two planes leave an airport at the same time with one flying west at 570 mph and the other flying east at 580 mph, how long will it take them to be 3450 miles apart? \n" ); document.write( "
Algebra.Com's Answer #440512 by jndarrell(58)\"\" \"About 
You can put this solution on YOUR website!
Create your D=RT box chart and fill in appropriately with the following data derived from your problem:
\n" ); document.write( "West
\n" ); document.write( "Rate: 570
\n" ); document.write( "Time: x\r
\n" ); document.write( "\n" ); document.write( "East
\n" ); document.write( "Rate: 580
\n" ); document.write( "Time: x\r
\n" ); document.write( "\n" ); document.write( "Time is x b/c that is what we are looking for. Always remember, when a problem provides you with a total distance, whether it be distance between two objects or total distance they are to travel...a total is a total. You will take the sum of the two objects R*T and set them equal to the total distance. See below:
\n" ); document.write( "570x + 580x = 3450
\n" ); document.write( "1150x = 3450
\n" ); document.write( "Divide both sides by 1150 to get your x alone
\n" ); document.write( "x= 3 hours\r
\n" ); document.write( "\n" ); document.write( "To check, take your D=RT formula and plug it into the equation created
\n" ); document.write( "570(3) + 580(3) = 3450
\n" ); document.write( "1710+1740
\n" ); document.write( "=3450 CHECK CORRECT!!!
\n" ); document.write( "Don't forget the units (hours) when providing your solution.\r
\n" ); document.write( "\n" ); document.write( "3 Hours
\n" ); document.write( ":) \n" ); document.write( "
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