A child sees a watch and tells the times to his father that it is 2 and half minutes past 6 O'clock. If by mistake he sees the hour hand to minute hand and minute hand to hour hand, then what is the correct time?
1. 30 mins to 12 O'clock
2. 6 O'clock
3. 2 O'clock
4. 12 O'clock past 30 minutes