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Math and logic riddle thread
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:55 pm
You’re both wrong
He’s in a regular car
It’s pouring
He’s driving on 60 mph and has perfect vision. No need for wipers.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:57 pm
ChanieMommy wrote:
Hidden: 

Oh, so you are on a car-train? But why would you sit in the car?

And if it's the channel-tunnel, it's a tunnel, so no downpour under the sea...

Oh wait. You kind of got it here.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 8:05 pm
Tamari wrote:
Hidden: 

Answer I got was 1:05 and 5.08 seconds. I have two double-sided sheets with scribbles, cuz I hate calculators, so I warn you if I'm very off......
As for showing work, no-one would understand....


Incorrect
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 8:06 pm
malki2 wrote:
Incorrect

I give up
The other answers given were correct?
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 8:08 pm
ChanieMommy wrote:
OK, still with the two hands of the clock.

So now we are at
Hidden: 

1:05:25.

5 minutes are 2,5° for the hour handle, so 1 minute would be 0.5°, so 25s would be (1/2)*25/60=5/24°

(5/24)° would be 10*5/24s for the minute handle, that would be 25/12 = 2,083333s

So the time to the 1/100 s would be 1:05:27,08

But wait, I have the solution: they never meet, just as Zenon's the paradoxon with the turtle says...

But fortunately we have the planck length, and Heisenberg's uncertainty principle, so they will meet all the same,

Hidden: 

after 1:05:27,083 and before 1:05:27,084.


Right?


The seconds are correct, but you are off by about twenty hundredths of a second. And yes they do meet. But you are in the right neighborhood with that concept if you would be using calculus to solve it.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 8:09 pm
Here’s a hint to solve it algebraically:

Use the equation: Distance = Rate x Time
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 8:09 pm
Tamari wrote:
I give up
The other answers given were correct?

Her riddles are not for the faint of heart.
Give us another one of your scale one.
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 13 2020, 8:13 pm
ExtraCredit wrote:
Oh wait. You kind of got it here.


So he's
Hidden: 

in a tunnel?


But I suppose then you would have to say "during a downpour", not"in a downpour"
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 8:19 pm
ChanieMommy wrote:
So he's
Hidden: 

in a tunnel?


But I suppose then you would have to say "during a downpour", not"in a downpour"


You’re probably right. I also nitpick words in riddles. But
Hidden: 

if he just about entered the tunnel and stopped his wipers for this mile or so isn’t he still driving in a downpour?
Well now that I’m typing it, I must agree with you. He’s totally driving ‘during” a downpour.
I changed the original one so that those who didn’t chew up their pencils yet, shouldn’t do it for naught.
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  doodlesmom  




 
 
    
 

Post Tue, Oct 13 2020, 8:46 pm
malki2 wrote:
At 12:00 the hour and minute hand are on the same spot. Exactly when, to the hundredth of a second, will they be together again?


With some help I figured out the math sort of.
Mathematicians help out here...

Hidden: 

So we know the hour hand will move 1/11th between 1 and 2 for every 5 minutes the clock moves. And after 1:05 it will be meeting at the first of these 1/11. So do you divide it 1/11 by 60?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 13 2020, 8:54 pm
doodlesmom wrote:
With some help I figured out the math sort of.
Mathematicians help out here...

Hidden: 

So we know the hour hand will move 1/11th between 1 and 2 for every 5 minutes the clock moves. And after 1:05 it will be meeting at the first of these 1/11. So do you divide it 1/11 by 60?


It would be 1/12th, no?
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 8:55 pm
doodlesmom wrote:
With some help I figured out the math sort of.
Mathematicians help out here...

Hidden: 

So we know the hour hand will move 1/11th between 1 and 2 for every 5 minutes the clock moves. And after 1:05 it will be meeting at the first of these 1/11. So do you divide it 1/11 by 60?


That won’t get you the answer exactly because you need to take into account the motion of the hours hand as well.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 9:00 pm
ChanieMommy wrote:
It would be 1/12th, no?

That’s how I got my answer which was deemed not even close. Crying
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  doodlesmom  




 
 
    
 

Post Tue, Oct 13 2020, 9:03 pm
malki2 wrote:
That won’t get you the answer exactly because you need to take into account the motion of the hours hand as well.


In my mind it makes sense lol..let me try a diff way
Hidden: 

..the hour hand also meets the minute hand 11 times in 12 hours.since it travels at the same speed it travels 1/11 Of the distance for each hour to meet the minute.
Say after 1 it’s plus 1/11
After 2 it’s plus 2/11.

So 1/11 of 60....
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  doodlesmom  




 
 
    
 

Post Tue, Oct 13 2020, 9:04 pm
ExtraCredit wrote:
That’s how I got my answer which was deemed not even close. Crying


No by the 12 th time it’s back to square 1. So only 11
Maybe try your calculations by 1/11 and you will be correct.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 9:10 pm
doodlesmom wrote:
In my mind it makes sense lol..let me try a diff way
Hidden: 

..the hour hand also meets the minute hand 11 times in 12 hours.since it travels at the same speed it travels 1/11 Of the distance for each hour to meet the minute.
Say after 1 it’s plus 1/11
After 2 it’s plus 2/11.

So 1/11 of 60....


Yes! 🎉🎉👏👏👏

Even though I did not solve it like that!
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 9:11 pm
So in terms of seconds, how many minutes and seconds is it?
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 9:13 pm
doodlesmom wrote:
No by the 12 th time it’s back to square 1. So only 11
Maybe try your calculations by 1/11 and you will be correct.


I didn’t realize what you were doing at first. It’s actually a very elegant way of solving the problem.
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 13 2020, 9:14 pm
malki2 wrote:
The seconds are correct, but you are off by about twenty hundredths of a second. And yes they do meet. But you are in the right neighborhood with that concept if you would be using calculus to solve it.


Right, I forgot the regression that came afterwards...


So I suppose it would be
Hidden: 

between 1:05:27,27 and 1:05:27,28
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  doodlesmom  




 
 
    
 

Post Tue, Oct 13 2020, 9:15 pm
malki2 wrote:
So in terms of seconds, how many minutes and seconds is it?

Hidden: 


5.45454545455


Per my calculator
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