document.write( "Question 718611: a car travelled at 60km/h for 2 1/2h. during the next 2h it travelled at 56km/h. for the last 1 1/2h of the journey it travelled at 50km/h. calculate the average speed of the car during the whole journey. \n" ); document.write( "
Algebra.Com's Answer #441026 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
a car travelled at 60km/h for 2 1/2h. during the next 2h it travelled at 56km/h. for the last 1 1/2h of the journey it travelled at 50km/h.
\n" ); document.write( "calculate the average speed of the car during the whole journey.
\n" ); document.write( ":
\n" ); document.write( "Find the total distance of the journey
\n" ); document.write( "60 * 2.5 = 150 km
\n" ); document.write( "56 * 2.0 = 112 km
\n" ); document.write( "50 * 1.5 = 75 km
\n" ); document.write( "---------------------
\n" ); document.write( "total dist: 337 km
\n" ); document.write( ":
\n" ); document.write( "Find the total time taken for the journey
\n" ); document.write( "2.5 + 2 + 1.5 = 6 hrs
\n" ); document.write( ":
\n" ); document.write( "Average speed = dist/time
\n" ); document.write( "av = 337/6
\n" ); document.write( "av = 56.167 km/hr \n" ); document.write( "
\n" );