FILE No.45Unsolved
At 8:00 p.m. (Japan time), a safe was ransacked in an office in Tokyo. Four people on business trips abroad each claim, "I was making a call from where I was at the time of the crime." The call records kept the local times.
Japan is ahead of Dubai by 5 hours, of Beijing by 1 hour and of Bangkok by 2 hours (none of these places uses daylight saving time).
Who was not on the phone at the time of the crime (8:00 p.m. Japan time)?
If you get stuck, open the hints one at a time, in order.
By how many hours is Japan ahead of each country?
Add that amount to each local time.
Who does not come to 8:00 p.m. in Japan time?
Who was not on the phone at the time of the crime (8:00 p.m. Japan time)?
Choose the answer closest to the truth.
Kato
The answer is Kato.
Convert each person’s local time to Japan time. Dubai 3:00 p.m. plus 5 hours is 8:00 p.m. in Japan (Ito). Beijing 7:00 p.m. plus 1 hour is 8:00 p.m. (Uno). Bangkok 6:00 p.m. plus 2 hours is 8:00 p.m. (Ogawa).
Kato’s Dubai 8:00 p.m. plus 5 hours is 1:00 a.m. Japan time (the next day). So he was not on the phone at the time of the crime, 8:00 p.m.
The "local times" in the call records are all written the same way, so you assume they are the same as Japan time.
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