15 miles per hour
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Time = Distance/Speed = 30 miles / 40 mph = 30/40 hours = 0.75 hours or 45 minutes.
The average speed is 120 miles per hour.
2hrs and 30 mins is the same as 2.5 hours. Mulitply 60 x 2.5 = 150 miles
Three hours (30/10 = 3).
Your average speed for the whole trip would be 30 mph.