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


If you get the correct answer, share it with your friends on WhatsApp, Facebook and other social networking sites.

5 Replies to “Logical Riddle: Which Tank Will be Full First III (6 Tank Both Versions)”

  1. 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.

  2. I don’t agree with your answer in the version 1 that tank 2 will fill first. Me and even my 8 year old son can tell that tank 3 will fill first. You are wrong on that tank 4 will start filling only after tank 2 is full. In fact tank 4 will start getting water when tank 2 is almost full (not completely full).
    And 4 drains into 3.

    1. do you even science bro, there won’t be enough pressure until it completely fills…, I get that your son would think it, but you… tsk tsk

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