The clock will show the incorrect time (between 1 – 2, 10 - 11, 11 - 12, 12 - 1 day and night both) ∴ in correct time 8 × 60 = 480 (each minute it will display 1) Remaining 20 hours it will show the incorrect time 16 × 15 = 240 Total incorrect time = 240 + 480 = 720 correct time = 1 – incorrect time =1−