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The pressure at the depth h1 = P1 = 3 * 10⁵ N/m² 
pressure at the depth h2 = P2 = 5 * 10⁵ N/m² 

Pressure exerted by a liquid (density d) column at a depth h, = d h g
So pressure is directly proportional to the depth in a liquid.

Hence ratio = h1 / h2 = P1 / P2  = 3/5 = 0.6

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there is no mistake . there is nothing wrong in accepting your mistake
Pressure in a fluid is inversely proportional to the depth
The answer is fine.
And shivam, pressure is directly proportional to depth in a fluid.
true tps and no need to argue... And if you want now i can give you the answer and the question is absolutely correct and is of iit level