Logic time

Logic Level 3

Tia woke up groggily in the morning and looked at a mirror image (vertical reflection) of her analog clock. She went to brush her teeth for 20 minutes, and then looked at the clock properly. She was shocked to see that it indicated 2 hours 30 minutes more than the original time she thought she read.

What was the time displayed when she read the clock correctly?

If your answer is HH:MM AM, then enter HHMM.

Follow a 12 hour system, not the 24 hour one.


The answer is 725.

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1 solution

Prince Loomba
Oct 11, 2016

First subtracting the extra 20 minutes, we get that the real time and mirror time were 2 hours 10 minutes apart.

Since it was morning, the hands should be closer to and symmetrical (mirror image) about 6 am.

So, 2 hours 10 minutes symmetrical about 6 am means 1 hour 5 minutes difference from 6 am or 4:55 and 7:05. Since the mirror showed less time, original time at that moment would be 7:05 and the time Emilia saw would be 7:05+20 minutes=7:25 am

Yes , we firstly calculate the difference between the clock without mirror and the mirrored clock at the same point of time so we know it rightle. Therefore the difference between the mirrored image seen at home and the actual hour was that 2. Now havign found such a difference or the actual difference between the clocks we calculate for what 2 times is say such a 2 hours and 10 minutes difference if they are distorted by the mirror and together with the claim that it's morning we have indeed it's at a difference of 65 minutes from 6. From this it's easy to deduce the rest and add things together such that we find the correct hour but funny problem for logical reasoning even if it's rather more of an exercise of logic and not a too serious problem despite it being or rather seeming tricky for the reason of calculating it just on the given information about difference anyway.

A A - 4 years, 8 months ago

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You left slack?!

Prince Loomba - 4 years, 8 months ago

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No way haha Prince. I was banned from slack to say most likely or rather so to say almost certainly by by calvin from abberant reasons and immediately afterwards from Brilliant anyway.

A A - 4 years, 8 months ago

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@A A I cant understand BANNED?!

Prince Loomba - 4 years, 8 months ago

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