The fluid pressure at the bottom of the container, just above the hole is given by the sum of pressures due to the columns of kerosene and water given by,
Let the atmospheric pressure be Po.
The fluid just above the hole at the bottom is assumed to be still in other words, velocity of the fluid just above the hole is 0.
Just below the hole, say water gushes out with a speed v. The fliud is now flowing into a region of of atmospheric pressure.
Applying Bernoulli's equation we have,
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