Question

Water is filled in a cylindrical vessel in such a way that its volume doubles after every five minutes. If it takes 30 minutes for the vessel to be full, then the vessel will be one fourth full in?

Answer 1

The ans of this question is 20 minutes because it takes 30 minutes for The vessel to be full and at 25 minutes the vessel was half because at 30 minutes the half doubles. and 20 minutes it was one fourth and gets doubled at 25 minutes. I Hope that it was helpful.
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Answer 2

Time and Work

Container is filled in 30 minutes.

.  ∴  Container is half-filled = $30 - 5 = 25\ minutes$

(since it gets filled fully in 30 minutes)

It is given that water is filled in a cylindrical vessel in such a way that its volume doubles after five minutes.

Hence time taken for the container to be one-fourth filled $= 25 - 5 = 20 \ minutes$ .

(∵ container is half filled in 25 minutes)

Hence the required time is 20 minutes.