It’s a quarter to 6 (Official clock system).

05:45

It’s a quarter to 6.

Correct answer

06:15

It’s a quarter past 6.

Error: mirror minute hand about the vertical axis

05:51

It’s 9 to 6.

Error: read minutes as hours with ‘past’ or ‘to’

09:45

It’s a quarter to 10.

Error: quarter to 10