International to domestic flight transfers at Beijing international airport terminal 3

Dear All,
I am Mohan from India.

I will be traveling from Mumbai- Beijing by Air China flight CA 890. This flight lands at 11.30 AM at BEIJING Capital international airport, TERMINAL 3.

My onward flight is also Air China CA 1541 from Beijing to Ningbo starting at 2.30 PM from TERMINAL 3.
so time between 2 flights is 3 hours. Is it enough? Because Beijing may have too much rush.

I will be getting both boarding passes in Mumbai itself.

My questions are as follows.
1.If my first flight gets delayed, and if i miss out onward flight then what Air China will do in this case?
2. Is it easy to save time by going in transfer process from one flight to another OR should I go to Air china counter and follow transfer process like immigration, customs etc.

Thanks..