I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Monday, October 31, 2005
Between 2 and 3
Between 2 and 3 o'clock yesterday, I looked at the clock and mistook the minute hand for the hour hand, and the hour hand for the minute hand. Consequently, the time appeared to be 55 minutes earlier than it actually was. What was the correct time?
Without the 30 seconds, it's not exactly 55 minutes. 2:05 - 1:10 is 55 minutes, but the hands aren't exactly in the right place. With every second, the minute had moves a little bit (if you have an accurate enough clock). Draw the picture and you'll see.
Of course, if you don't have that accurate a clock (say the minute hand doesn't move until the second piece moves to the top), then it doesn't matter what the seconds are.
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what he said
ReplyDeleteVery close, but no cigar:
ReplyDeleteFive and a half minutes past 2 o'clock.
Without the 30 seconds, it's not exactly 55 minutes. 2:05 - 1:10 is 55 minutes, but the hands aren't exactly in the right place. With every second, the minute had moves a little bit (if you have an accurate enough clock). Draw the picture and you'll see.
ReplyDeleteOf course, if you don't have that accurate a clock (say the minute hand doesn't move until the second piece moves to the top), then it doesn't matter what the seconds are.