The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross-section. Cross sectional areas at $A$ is $1.5 \mathrm{~cm}^2$, and $B$ is $25 \mathrm{~mm}^2$, if the speed of liquid at $B$ is $60 \mathrm{~cm} / \mathrm{s}$ then ( $P_A- P_B$ ) is (Given $P_A$ and $P_B$ are liquid pressures at $A$ and $B$ points. Density $\rho=1000 \mathrm{~kg} \mathrm{~m}^{-3}$ A and B are on the axis of tube