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During a road trip, Richard drove his car at 80mph for 1 hour, and
then at 60mph for 1 1/2 hours. What was the average speed for the
entire journey?
 

 Apr 12, 2018
 #1
avatar+99397 
+2

Avg Speed  =   Total distance / Total time

 

So we have

 

[ 80 * 1  + 60 * 1.5 ]    / [ 1 + 1.5 ]  =

 

[ 80 + 90 ]  / [ 2.5 ] =

 

[ 170 ] / [ 2.5 ] =

 

68 mph

 

 

cool cool cool

 Apr 12, 2018

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