Hi,

Average speed would be:

 

Answer by jrfrunner(365)   (Show Source): You can put this solution on YOUR website!
 d=r*t or  r=d/t  where r=rate or speed, d=distance and t=time

==

To compute average rate you have to take Total distance divided by Total time

==

Total time there   t1=d/r=330/60=5.5hours

Total time back  t2=d/r = 330/40=8.25 hours

Total time round trip  t1+t2=5.5 + 8.25 = 13.75 hours

Total distance =330+330 = 660

--

average trip rate (or speed) = 660/13.75=48.17 mph



 

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