\( V= \frac{l}{t} \)

\( l= l_{1} + l_{2} + l_{3} +. \)

\( t= t_{1}+ t_{2}+ t_{3}+. \)

\( V_{cep} = \frac{ l_{1}+ l_{2}+ l_{3}+. }{ t_{1}+ t_{2}+ t_{3}+.} \)