Solutions to Guards and Clock Problem

Solutions to na couple of problems and a new problem for you to get your teeth into.


A couple of aeons ago in the post I put up immediately before setting off for Marxism 2018 I presented two problems from, one easy and one hard. Now at long last I offer solutions to them.


Here is the answer:

Guards answer

Now here is an official solution, posted by Siva Budaraju:

Guards solution

Yes, Anna, you were right about this one, as you are about many things. 


For this one I shall present the confirmation that my answer was correct, my sneaky way of solving the problem and then an official solution.

Clock answer

I got the solution by realising that if there was an arrangement of the hands that enabled this to happen it would not be unique – as with problems involving two hands on a clockface there would be a number of possibilities, which would mean that finding such an arrangement would not be very difficult, and this was supposed to be a dificult problem, which led me to the conclusion that there could not be a time when the three hands divided the clockface into equal segments. Now here are two official solutions:

clock solution


I finish by sharing another problem with you that I enjoyed solving:

3 and 2




Author: Thomas

I am a founder member and currently secretary of the West Norfolk Autism Group and am autistic myself. I am a very keen photographer and almost every blog post I produce will feature some of my own photographs. I am an avidly keen cricket fan and often post about that sport.

3 thoughts on “Solutions to Guards and Clock Problem”

  1. Thanks! I’m glad I was right about that one, but the other two problems I understand very little of. Visual problems like the first one is easy for me sometimes, but then other two containing maths, then I’m lost 🙂

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