Riddle Me This

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4
and
if those tanks do not have lids, only 4 will be filled.
^^^
I thought I had the answer bookmarked but cannot find it now.
I'm thinking 3 for now. If not then 3 & 4. A short search found 3 different answers : 3, 4 & both 3 & 4.
I am certain it cannot be 1 or 2 or both.
I will be searching more.

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3

Water will flow into

2 and straight out into

3 and rise up to outlet pipe leading to

4 when it will begin to flow into

4

The water flowing from

3 to

4 will be replaced by the incoming water from

2 keeping

3 full

:) I hope :)

:)
^^^
Very close to what I was thinking. Also that it takes more pressure to force water up than straight across thus 3 must be fuller than 4 & will be full just before 4 is.

Anyone else?

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^^^
Very close to what I was thinking. Also that it takes more pressure to force water up than straight across thus 3 must be fuller than 4 & will be full just before 4 is.

Anyone else?

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Once the flow from

3 reaches the overflow into

4 the water flow effectively becomes a direct flow from

2 into

4

As a sub question

The pressure from 3 is pushing water up connecting tube to 4

Once water begins to flow into 4 does the water going across the level tube

Drop in pressure?

Remains at same pressure?

Increase in pressure?

My thinking is drop but I am by no means certain

:)
 
I need to copy this to a document to answer at this point. I would not want this to happen much but maybe it is good I lost the solution. This is interesting.

(Damn. I meant to reply to your post.)

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With the tank question, water will rise up in tank 3 until it is level with the inlet to tank 4, and tank 4 will only start filling after that. So if tank 3 is considered "full" when the water is at the level of the inlet to tank 4, then tank 3 will definitely fill first. While 3 is filling, water will be running from 1 to 2 to 3, so that 1 and 2 won't fill up.

Also, if tank 4 is open at the top, then 1 and 2 will never fill up unless the flow rate from the input tap is very high.
 
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