2, but everyone's physique is different, so we should set the speed according to our actual situation. So there are still differences in details. But if it belongs to the general constitution, it is good to control the speed within 7 to12 km/hr.
3, the speed of running to lose weight depends on the specific situation of running, as well as personal physique, and can not be generalized.
Generally speaking, if you keep jogging for 30 minutes every time, 4 to 5 times a week and eat regularly, 1 to 2 weeks, you will see weight loss. However, if there is no good persistence, or poor diet coordination, such as frequent emotional eating or overeating, it will also have a great impact. Therefore, the effect of running to lose weight can only be seen according to the overall implementation.