# Logical Riddle: Which Tank Will be Full First III (6 Tank Both Versions)

I received 1 more of the “Which-tank-will-fill-first” riddles in 2 versions.

I am including both the versions in this riddle along with answers.

Looking at the picture below, which tank will fill first?

Version 1

Version 2

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### 7 thoughts on “Logical Riddle: Which Tank Will be Full First III (6 Tank Both Versions)”

1. I agree with “S” and his son. The pipe from 5 to 2 is lower than the top of 2, and the pipe from 2 to 4 enters 4 below the top of 2. Therefore 2 can never fill up completely.

There is no information given about flow or pipe size, so those variables cannot be part of the answer.

2. In ver 2 tank 5 because it is blocked at 2 and would not fill any other of the tanks

3. In the top version, there can be two answers. If the tap is wide open, then 1 will fill first, just because the water will be unable to drain into 5 fast enough. If the flow is slow enough, then the water goes from 1 to 5 to 2, which fills first. Water always seeks its own level. That is fact. The pipe going into 4 is at the same level as the water flowing out of 5, which means the water will not flow into 4 until it reaches that level. However, the pipe going from 2 to 4 is narrower than the pipe from 5 to 2, this means the water will flow into 2 faster than it is able to flow out. So 2 will fill first.
In the second version, same thing as to flow. It will be either 1 or 5.