FILE No.150Unsolved
Taro suffers from insomnia. Last night he went to bed at 3 and got up at 6. When a friend asked, "What time did you go to bed last night?" he answered, "I slept like crazy last night!"
There is nothing wrong with Taro's sense of things.
Taro really did sleep for a long time. Why?
If you get stuck, open the hints one at a time, in order.
Is "3 o'clock" a.m. or p.m.?
Does the problem hold with either "3 o'clock"?
How many hours did he sleep?
Taro really did sleep for a long time. Why?
Choose the answer closest to the truth.
Went to bed at 3 p.m. and got up at 6 the next morning (15 hours)
The answer is "Went to bed at 3 p.m. and got up at 6 the next morning (15 hours)."
He said only that he "went to bed at 3 and got up at 6," without saying a.m. or p.m. If he went to bed at 3 p.m., he slept 15 hours until 6 the next morning.
From 3 a.m. to 6 a.m. would be only 3 hours.
Because on hearing "3 o'clock," you assume it is 3 in the middle of the night.
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