7. Calculate the average speed of an automobile running at the rate of 25 miles per hour during the first
miles, at 20 miles per hour during the second 30 miles and at 15 miles per hour during the next 30 -
Find the average speed.
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2 days ago — Calculate the average speed of an automobile running at the ... at 20 miles per hour during the second 30 miles and at 15
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