It’s 17 to 6 (Official clock system).

05:43

It’s 17 to 6.

Correct answer

05:42

It’s 18 to 6.

Error: 1 minute earlier

04:49

It’s 11 to 5.

Error: read minutes starting from hour markings and adding minutes

09:25

It’s 25 past 9.

Error: confuse hour and minute hands