It’s 11 past 9 (Official clock system).

21:11

It’s 11 past 9.

Correct answer

21:12

It’s 12 past 9.

Error: 1 minute later

21:03

It’s 3 past 9.

Error: read minutes starting from hour markings and adding minutes

14:45

It’s a quarter to 3.

Error: confuse hour and minute hands