For more advanced runners 2km can be achieved around 8 minutes and 5 minutes for a professional runners. The current world recorded 2km time is 4.44. The average time it takes to run 2km varies depending on a person’s fitness level, weight, age, and gender. But generally speaking, most people can run 2 kilometres in under 20 minutes.
At the beginning, run 10 - 25 seconds per mile (or 5 - 15 sec/km) slower than your goal pace. Once you're at the second third of the race, speed up to the goal pace. At the end, try to run 10 - 25 seconds per mile (or 5 - 15 sec/km) faster than the goal pace.
A 5K time sub 20 minutes is great. This would put a runner into the top 5% in most local races. In more competitive races, they would still most likely be in the top 20% or so if running a sub 20-minute 5k. It will most likely take dedicated training to get to that level. 5k is a great distance to test speed and endurance which is why many

The current 5K world record is at 12:35.36 and held by Joshua Cheptegei. But as a beginner, expect to finish the race within the 30 to 40 minutes range—longer if you’re walking/running. Running 5K at 5-minute mile pace: 15 minutes 32 seconds. Running 5K at 6-minute mile pace: 18 minutes 38 seconds.

At these paces, running 30 minutes would be 4.1 miles or 6.67 kilometers. For women, the average 5k time is 26:07, which is an 8:24 mile pace or 5:13 per kilometer. Therefore, 30 minutes of running in distance measurements for this average race pace would be 3.57 miles or 5.22 km. Keep in mind that a 5k race pace is not a very good indication
Therefore, if you run 5km 3 times a week you can expect to burn 1500 calories a week resulting in half a pound of weight loss. On average, it takes approximately 3500 calories to burn 1 pound of body fat. However, your weight loss will also depend on other factors like your diet, age, gender, and starting weight.
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how to run 5 kilometers in 20 minutes