Sergeant Rote goes to bed at 1 o'clock. He sleeps for 3 hours, then wakes up, and immediately falls back asleep for 3 more hours. He does this 155 times in total. What time is it when he finally gets up? (Ignore AM/PM)
We have 155 six hour blocks of time
So we can compute this
(6 * 155) mod 24 = 18
So........it will be 18 hours after 1 o'clock = 7 o'clock