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Your average speed is 10 miles per hour.
1.5 miles/12 minutes = 7.5 miles/hour
Your avarage speed would be 12 miles an hour.
(.25 miles / 3 minutes) * (60 minutes / 1 hr) = (.25 * 60)/3 = 5 mph If you run a quarter mile in 3 minutes, your average speed is 5 mph.
To run 1.5 miles in 12.5 minutes you must maintain an average speed of 11.6 km/h