It’s 11 to 1 (Official clock system).

00:49

It’s 11 to 1.

Correct answer

00:50

It’s 10 to 1.

Error: 1 minute later

11:51

It’s 9 to 12.

Error: read minutes starting from hour markings and adding minutes

10:00

It’s 10 o’clock.

Error: confuse hour and minute hands