Hot answers tagged

21

Would it be because:


13

If we set the clocks like this (hour hands omitted, since we don't care about them) we get touching minute hands at every possible occasion, that is, whenever a minute hand points at another clock, there will always be a minute hand pointing back. Since we cannot change how often a minute hand points at another clock, and there cannot be any touching when a ...


11

I think the year is The first gentleman is born on The second gentleman was born in Additionally,


7

On January 21, 2019, On May 7, 2020, On March 1, 2018,


5

NOTE: This answer assumes we must deduce the restart times of the clocks without restarting them, and hence being unable to observe hands' behavior; I made this assumption so as to not trivialize parts of the puzzle. How to fix the clocks: The current time is (deduced from the Pendulum clock) To fix the Precision Clock, Restart the precision clock at To ...


4

One key observation is that So if there are more Fridays and Saturdays than other days of the week in the year Marina was born then it must be that Finally Now you are not asked for her birth year but given that she is between 20-29 years old in 2012 we find that


3

Actually, this can be solved even without using information about "Fridays and Saturdays".


3

Which, though? The prisoner should Note:


3

After some time of inactivity I'd like to post another answer. I hope it's understandable despite its brevity. The chances are that the hour hand is closer to the 12 at a random time. Proof:


3

The best answer is "time to get a new clock" but the two best times are 9:05:25.452 and 2:54:34.548, with angles HM=119.83°, HS=120.00° and MS=120.17°. Python code: import numpy as np def bestN(a, b, c, N=1): e1 = np.abs(((b-a) % 60) -20) e2 = np.abs(((c-b) % 60) -20) e3 = np.abs(((a-c) % 60) -20) return np.argpartition(e1+e2+e3,N)[:...


2

As with the other question, That's not actually quite true, because But, wait. But (confession: I failed to spot this despite attempting to check; thanks to Jaap Scherphuis in comments for being less stupid than me) So in fact


2

An analog clock mechanism with only two hands has meaning that every angle (counting from the minute hand to the hour hand in the same direction) repeats exactly that many times during a 12 hour period. The question then becomes: can the second hand (which is the third hand, really) distinguish between those symmetrical cases? If all the hands move by "...


1

Assuming they synchronise their watches when leaving the office, they’ll have a 10 min difference accumulating every hour. Assuming a standard 5-day week and 8-hour day, Tuesday through Friday, they’ll be separated for a nominal 16h (by each watch), so they will out by 160 min: one early by 80 min, the other late by 80 min; Monday, they’ll be separated for ...


1



1

As @WhatsUp mentioned in a comment,


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