$4.$ A liquid $($p $=1\mathrm{.}65$ g$/$cm$^3)$ flows through two horizontal sections of tubing joined end to end. In the first section, the cross$-$sectional area is $10\mathrm{.}0$ cm$^2,$ the flow speed is $275$ cm$/$s$,$ and the pressure is $1\mathrm{.}20$x$105$ Pa$.$ In the second section, the cross$-$sectional area is $2\mathrm{.}50$ cm$^2.$ Calculate the smaller section$\text{'}$s $($a$)$ flow speed and $($b$)$ pressure.