FILE No.170Unsolved
A safe in an office was broken into. The crime happened between 10:30 p.m. and 11 p.m. The electronic lock on the door records the time of entry of the person who used a key.
The suspect's record: entered at 9:40 p.m., with no record of leaving. The suspect claims, "I went in at 9:40 and left before 10. That was before the crime."
However, when it was checked later, the electronic lock's clock was one hour slower than the actual time.
At what time did the suspect actually enter?
If you get stuck, open the hints one at a time, in order.
Is the clock fast or slow?
When it is slow, do you add or subtract to get the actual time?
Does the corrected time fall within the time of the crime?
At what time did the suspect actually enter?
Choose the answer closest to the truth.
10:40 p.m.
The answer is "10:40 p.m."
The electronic lock's clock is one hour behind the actual time. The log's "9:40" is actually "10:40."
10:40 falls within the time of the crime (10:30 to 11:00). The suspect's claim falls apart. The point is that when a clock is slow you "add." If you subtract, you get 8:40, and the suspect would look innocent instead.
Because you believe a time shown in a log as it is.
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