It’s 11 to 3 (Official clock system).

02:49

It’s 11 to 3.

Correct answer

02:50

It’s 10 to 3.

Error: 1 minute later

01:51

It’s 9 to 2.

Error: read minutes starting from hour markings and adding minutes

10:10

It’s 10 past 10.

Error: confuse hour and minute hands