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Mr. Smith was driving 50 mph for the first two hours of his trip, then 60 mph for the remaining three hours.  What was the average speed for the whole trip?

 May 14, 2020
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For the first two hours, he drove at 50 mph: 

   Distance = Rate x Time   --->  Distance  =  50 mph x 2 hrs  =  100 miles

 

For the next three hours, he drove at 60 mph:

    Distance  =  60 mph x 3 hours  =  180 miles

 

Total distance  =  280 miles                           Total time  =  5 hours

 

To find the average speed:

    Distance  =  Rate x Time

     280 mi    =  Rate x 5 hours                 (divide both sides by 5 hours)

      56 mph  =  Rate  

 May 14, 2020

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