Grid 4 by 4 with numbers and letters

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gmgm
Posts: 23
Joined: Wed Jun 18, 2014 4:55 pm UTC

Grid 4 by 4 with numbers and letters

Postby gmgm » Wed Jul 02, 2014 3:02 pm UTC

Here's another puzzle that I haven't solved yet. Instructions are the same as with the last puzzle I posted, read them here: http://forums.xkcd.com/viewtopic.php?f=3&t=109269.

We are given the following numbers and letters in a grid 4 by 4. There is one empty square there between the '8's, but there is no indication that we are looking for something to fit in that square. It could be that, or it could be something else. Again, the answer we are looking for should be in the form of one letter, either upper case or lower case.

Code: Select all

1 0 7 k
9 2 m 5
2 p 8 4
h 8   8


Anyone recognize a common type of puzzle?
Any suggestions, ideas, thoughts, narrowing of possible answers would be very welcome!

Poluma_Omusa
Posts: 1
Joined: Thu Jul 03, 2014 4:57 am UTC

Re: Grid 4 by 4 with numbers and letters

Postby Poluma_Omusa » Thu Jul 03, 2014 5:02 am UTC

Hmm. Not at all helpful, but the first line, 1 0 7 k , is the ASCII value 107 for the lower case k.

Cauchy
Posts: 602
Joined: Wed Mar 28, 2007 1:43 pm UTC

Re: Grid 4 by 4 with numbers and letters

Postby Cauchy » Fri Jul 04, 2014 9:41 am UTC

The letters on the diagonal read "kmph" from top to bottom, i.e. kilometers per hour. I don't know if this leads anywhere.
(∫|p|2)(∫|q|2) ≥ (∫|pq|)2
Thanks, skeptical scientist, for knowing symbols and giving them to me.

thefargo
Posts: 36
Joined: Mon Jan 20, 2014 3:45 pm UTC

Re: Grid 4 by 4 with numbers and letters

Postby thefargo » Tue Jul 29, 2014 8:35 pm UTC

Cauchy - you made the key observation.

The exact speed of light in km/hr is:
1.079252848.8

So the blank spot is a decimal point.

taemyr
Posts: 111
Joined: Fri Jan 26, 2007 12:14 pm UTC

Re: Grid 4 by 4 with numbers and letters

Postby taemyr » Wed Jul 30, 2014 11:37 am UTC

thefargo wrote:So the blank spot is a decimal point.


Well spotted.

Considering that OP asked for a single upper or lower case letter I would say 'c' is the letter we are after.

gmgm
Posts: 23
Joined: Wed Jun 18, 2014 4:55 pm UTC

Re: Grid 4 by 4 with numbers and letters

Postby gmgm » Sat Aug 02, 2014 7:39 am UTC

It definitely looks like you found the answer. Thanks Cauchy for directing our attention to the "kmph" clue. At the time I didn't think it was that significant. Thanks thefargo for coming up with the breakthrough idea to look for this notable constant! And thanks taemyr and everyone else who looked at the puzzle.
I posted a new mystery puzzle for you: http://forums.xkcd.com/viewtopic.php?f=3&t=109590


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