document.write( "Question 303595: a car travels 2 3/4 hours at an average speed of 60 km/hour and then for 2 1/4 hours at an average speed of 80km/hour. whats is the average speed of the whole journey?\r
\n" ); document.write( "\n" ); document.write( "i have worked out: \r
\n" ); document.write( "\n" ); document.write( "2 3/4 hours= 2 hours, 45 mins\r
\n" ); document.write( "\n" ); document.write( "2 1/4 hours= 2 hours and 15 mins \n" ); document.write( "
Algebra.Com's Answer #217563 by mananth(16946)\"\" \"About 
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a car travels 2 3/4 hours at an average speed of 60 km/hour and then for 2 1/4 hours at an average speed of 80km/hour. whats is the average speed of the whole journey?\r
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\n" ); document.write( "\n" ); document.write( "2 3/4 hours 60 km/hr\r
\n" ); document.write( "\n" ); document.write( "Distance traveled at this speed = 11/4 *60 = 165 km\r
\n" ); document.write( "\n" ); document.write( "2 1/4 hour 80 km/hr\r
\n" ); document.write( "\n" ); document.write( "Distance traveled at this speed = 9/4 * 80 = 180 miles\r
\n" ); document.write( "\n" ); document.write( "Total miles driven = 165+180= 345 km\r
\n" ); document.write( "\n" ); document.write( "Total time taken = 5 hours\r
\n" ); document.write( "\n" ); document.write( "Average speed for the total journey = total distance / total time = 345 / 5\r
\n" ); document.write( "\n" ); document.write( "69 km / hour\r
\n" ); document.write( "\n" ); document.write( "Ananth
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