document.write( "Question 818285: [ A car travels 180 km at 70 km/h and returns to the initial departure point at 60 km/h. Calculate average speed of the car. ] \n" ); document.write( "

Algebra.Com's Answer #492542 by TimothyLamb(4379) $\"\"$ $\"About$

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s = d / t
\n" ); document.write( "t = d / s
\n" ); document.write( "---
\n" ); document.write( "outbound:
\n" ); document.write( "ta = d / s
\n" ); document.write( "ta = 180/70
\n" ); document.write( "---
\n" ); document.write( "return:
\n" ); document.write( "tb = d / s
\n" ); document.write( "tb = 180/60
\n" ); document.write( "---
\n" ); document.write( "total time:
\n" ); document.write( "ta + tb = (180/70) + (180/60)
\n" ); document.write( "ta + tb = 5.5414286 hours
\n" ); document.write( "---
\n" ); document.write( "average speed:
\n" ); document.write( "s = d / t
\n" ); document.write( "s = (2)(180) / (ta + tb)
\n" ); document.write( "s = (360) / (5.5414286)
\n" ); document.write( "---
\n" ); document.write( "s = 64.615 kph
\n" ); document.write( "---
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