10 km, thrice a week! I think that's too much for a newbie. I'm no professional but 4 to 5 km per day 4 days a week should be fine. You should not tax your body at the very beginning. You should only go as far as your body permits you to do.
Your body acquires resilience and endurance strength in a phased manner and with the help of proper diet and adequate rest. 10 km at a stretch and 20 km thereafter is not prudent.
Your body acquires resilience and endurance strength in a phased manner and with the help of proper diet and adequate rest. 10 km at a stretch and 20 km thereafter is not prudent.