(12 meter/second) (60 sec/minute) (15 minutes) =
(12 60 15) (meter second minute / second minute) =
10,800 meters (10.8 km, about 6.7 miles)
Note: This question doesn't represent a real-world situation. Usain Bolt's best time for 100 meters ... the current world record ... is a speed of 10.4 m/s !