Your speed belongs to fast walking or even jogging. Aerobic weight loss must meet three basic conditions: 1, and large muscle groups of the whole body participate in exercise. 2. Heart rate reaches 130- 170. 3, lasting more than 30 minutes. So it can't be calculated in kilometers, but in time. Because glycogen was consumed by the body 25 minutes ago, 25-50 minutes is the time to lose fat. Are you afraid of running for less than 50 minutes at a time? It doesn't matter. Walk for 25 minutes at a speed of 5Km, jog for 25 minutes at a speed of 6-8km, then slowly shorten the walking time, keep it five times a week, have a light diet, and stop snack, snacks, carbonated drinks, etc. And you can lose 4-6 kg a month.