Problem $5(10\%)$: The following equations describe a fluid$-$flow system. Draw and label the system.

$m_1+m_2=m_3=m{l}_4$

$\frac{P_4-P_3}{}+\frac{v_4^2-v_3^2}{2}-W_s=0$

$\frac{P_5-P_4}{}-\frac{v_4^2}{2}+g(z_5-z_4)+e_f=0$