Answer;
9 miles per hour.
Solution;
Convert 41 minutes to seconds and add 25 seconds to that, then divide by 60 to convert to hours.
41 min = 2460 seconds (+ 25 seconds) = 2485/ 60 = 41.417 minutes (0.6903 hours).
Speed = 10 km/0.6903 hr = 14.4869 km/hr
But 1 mile = 1.60934 km
Thus; 14.4869 kilometers = 9.0017 miles.
So the runner's average speed is roughly 9 miles per hour.