document.write( "Question 826091: Kimberly took three hours to drive to her friends home on the weekend. Her average speed was 85 km/h for the first two hours. What was her average speed for the last hour of the trip if her average speed was 75 km/h for the whole trip? \n" ); document.write( "
Algebra.Com's Answer #497901 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Kimberly took three hours to drive to her friends home on the weekend. \n" ); document.write( " Her average speed was 85 km/h for the first two hours. \n" ); document.write( " What was her average speed for the last hour of the trip if her average speed was 75 km/h for the whole trip? \n" ); document.write( ": \n" ); document.write( "Let s = the speed on the last hour of the trip \n" ); document.write( ": \n" ); document.write( "Write a distance equation, dist = time * speed \n" ); document.write( ": \n" ); document.write( "dist 1st 2 hr + dist last hr = total dist \n" ); document.write( "2(85) + 1s = 3(75) \n" ); document.write( "190 + s = 225 \n" ); document.write( "s = 225 - 190 \n" ); document.write( "s = 35 km/h for the last hour \n" ); document.write( " |