document.write( "Question 1174119: One morning, Justin drove 3 hours before stopping to eat lunch at Chick-fil-A. After lunch, he increased his speed by 10 mph. If he completed a 450-mile trip in 8 hours of driving time, how fast did he drive in the morning? \n" ); document.write( "
Algebra.Com's Answer #799500 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! 3 hours in morning \n" ); document.write( "5 in the afternoon \n" ); document.write( "speed is x miles/hr in morning and distance therefore is 3x miles \n" ); document.write( "in the afternoon, it is 5*(x+10) or 5x+50 miles \n" ); document.write( "That sum, 8x mi/hr*hr+50mi=450 mi; \n" ); document.write( "x=50 miles/hr for 3 hours (150 miles) \n" ); document.write( "x+10=60 miles per/hour *5 hours or 300 miles \n" ); document.write( "- \n" ); document.write( "50 mi/hr \n" ); document.write( " |