<PRE><B>Question 481036</B>
In traveling from city A to city B, John drove for 1 hour at 50 mph and for 3 hours at 60 mph. What was his average speed for the whole trip 
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1 hr distance: 1 hr*50mph = 50 miles
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3 hr distance: 3 hr*60mph = 180 miles
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Average speed = (total distance)/(total time)
= (50+180)/4 
= 230/4
= 57.5 mph
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Cheers,
Stan H.
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