Question: 5k in 30 minutes is how many mph?
Answer: For example, if you want to finish your 5K in 30 minutes, divide 3.1 by 0.5, which equals 30, and divide that by 60, for a result of 6.2 mph. Applying the same formula to complete a 5K in 25, 20 or 15 minutes, set the treadmill speed at 7.4, 9.3 and 12.4 mph, respectively.