A tank contains 140 cm height of water at the bottom and an oil of density \(900\,kg\,m^{-3}\) to a height of 200 cm above water. If the liquids are immiscible, then the initial velocity of efflux of water through a small opening at the bottom of the tank is:
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For layered liquids:
\[
h_{eq}
=
\sum \frac{\rho_i}{\rho_w}h_i.
\]
Convert every liquid column into equivalent water head.