You drive from a to b at 20 mph and return by the same route at 30 mph. what was your average speed for the total duration of the drive?
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A to B: 1 hour = 20 mph
⇒ 1 hour = 20 miles
B to A : 1 hour = 30 mph
⇒1 hour = 30 miles
Average speed = (20 + 30) ÷ 2 = 15 mph
Answer: The average speed is 15mph
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