Here we hope to answer the above tank problem.
Explanation:
The water in Tank No. 1 begins to flow from Tank No. 1 to Tank No. 2. Accordingly, Tank No. 2 is full.
Water in Tank No. 2 begins to flow from Tank No. 2 to Tank No. 3. Accordingly, tank number 3 is full.
Since the outflow of tank No. 3 and the inflow of water in tank No. 4 are not at the same level, water enters tank No. 3 until tank No. 4 is filled.
Accordingly, Tank No. 3 and Tank No. 4 will be filled at the same time.
A. Tanks 3 and 4 are.
It can be further explained by studying the image below.