document.write( "Question 254460: A car travels 60km at 30km/h and then a further 180km @ 16- km/h. Find:
\n" ); document.write( "a) Total time taken.
\n" ); document.write( "b) The average Speed for whole Journey. \n" ); document.write( "
Algebra.Com's Answer #186792 by nerdybill(7384)\"\" \"About 
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A car travels 60km at 30km/h and then a further 180km @ 16- km/h. Find:
\n" ); document.write( "a) Total time taken.
\n" ); document.write( "b) The average Speed for whole Journey.
\n" ); document.write( ".
\n" ); document.write( "Applying the \"distance formula\": d = rt
\n" ); document.write( "where
\n" ); document.write( "d is distance
\n" ); document.write( "r is rate or speed
\n" ); document.write( "t is time
\n" ); document.write( ".
\n" ); document.write( "For the car traveling 60km at 30km/h:
\n" ); document.write( "time:
\n" ); document.write( "d = rt
\n" ); document.write( "d/r = t
\n" ); document.write( "60/30 = t
\n" ); document.write( "2 hrs = t
\n" ); document.write( "distance:
\n" ); document.write( "60 km
\n" ); document.write( ".
\n" ); document.write( "Traveling 180km @ 16- km/h:
\n" ); document.write( "time:
\n" ); document.write( "d = rt
\n" ); document.write( "d/r = t
\n" ); document.write( "180/16 = t
\n" ); document.write( "11.25 hrs = t
\n" ); document.write( "distance:
\n" ); document.write( "180 km
\n" ); document.write( ".
\n" ); document.write( "a) Total time taken:
\n" ); document.write( "2 + 11.25 = 13.25 hours
\n" ); document.write( "b) The average Speed for whole Journey.
\n" ); document.write( "Total distance: 60+180=240 km
\n" ); document.write( "Average speed:
\n" ); document.write( "240/13.25
\n" ); document.write( "= 18.11 km/h \n" ); document.write( "
\n" );