It’s 21 past 5 (Official clock system).

17:21

It’s 21 past 5.

Correct answer

17:22

It’s 22 past 5.

Error: 1 minute later

17:05

It’s 5 past 5.

Error: read minutes starting from hour markings and adding minutes

16:25

It’s 25 past 4.

Error: confuse hour and minute hands