It’s 18 past 3 (Official clock system).

15:18

It’s 18 past 3.

Correct answer

15:19

It’s 19 past 3.

Error: 1 minute later

15:06

It’s 6 past 3.

Error: read minutes starting from hour markings and adding minutes

16:15

It’s a quarter past 4.

Error: confuse hour and minute hands