Answer: 4/9
Step-by-step explanation:
Find out combinations without 5 or 6.
Minutes with 5 or 6: 05,06,15,16,25,26,35,36,45,46,50–59. It 10+10=20 minutes per hour. And 40 minutes without 5 or 6.
Hours with 5 or 6: 5 and 6. Without 5 and 6 is 0,1,2,3,4,7,8,9,10,11 (10 hours).
Total time without 5 and 6 is 10*40minutes=400 minutes.
Time with 5 or 6 is 12*60–400=320 minutes.
Fraction of a day: 320/(12*60)=4/9=0.44444
