Can you tell with Explanation which one among the 7 bottles fills up first ?

This is the next question in the "which one will fill up" series of questions. Look closely on the above image and share if you get the answer.

Answer


Bottle 5 will fill up first. Because, there valve has no opening from bottle 1 towards bottle 2. Similarly there is no opening for the pipe connected between pipe 3 to pipe 7.

Another Solution
If we ignore the valve closing on some pipe towards bottle, then bottle 6 would fill up first.

If you have any other answer, submit it as a comment at the bottom of this post with explanation.