Wednesday, April 24, 2013

Brain Teaser 4/24/2013

1. The logic professor posted a notice on his class door: "Class is canceled today on account of spring. We will meet again at 1:00 P.M. three days after two days before the day before tomorrow." What day does the class meet?

2. Between noon and midnight, but not counting these times, how often will the minute hand and hour hand of a clock overlap?

1 comment:

Kevin said...

Sent to my by one of our readers....

Your answer to the 2d of the puzzles presented on 04/24/13 is wrong. There are in fact 11 times between noon and midnight when the hour and minute hands of an analog clock overlap, and those times are: 1:05, 2:10, 3:15, 4:20, 5:25, 6:30, 7:35, 8:40, 9:45, 10:50, and 11:55. You are mistaken when you say that there is on such instance of overlap between the hours of 11 PM and 12 midnight, because there is such an instance, and it occurs at 11:55. ---Conway