John is living and working in a hermetically
sealed bubble, investigating where socks go to live after visiting
the dryer. His sense of in-built time is
slowly fading. He has two clocks. One is fast, with
1 minute being recorded as 1 minute, 30 seconds. The other
is slow, with 1 minute being recorded as 30 seconds.
John entered the bubble on December 1, 1990
at 00:01:00. His two clocks were correct at that time.
How many times during the month of December will both
clocks be correct AT THE SAME TIME? Both are 12-hour clocks.
Fun With Bubble-Boy