went 5 miles uphill at 40 mph, it took 5 miles/40 mph = 1/8 hour to travel uphill. went 5 miles downhill at 60 mph, it took 5 miles/60 mph = 1/12 hour to travel downhill. e car traveled a total of 5 + 5 = 10 miles over 1/8 + 1/12 = 3/24 + 2/24 = 5/24 hour. This gives us an average speed of 10mi /.(5/24 hour) = ph = 48 mph. at the most common mistake is simply averaging 40 mph and 60 mph for an average speed of 50 mph.

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