Pai se schimba daca in (1):
[tex]\tt t=t_{1}+t_{2}\Rightarrow t_{2}=t-t_{1}\\ \\[/tex]
In (2) ai estimat t2, iar mai sus ai alta formula pentru t2, astfel egalezi:
[tex]\tt t-t_{1}=\frac{v_{2} \times t-v_{1}\times t_{1}}{v_{3}}\\ \\[/tex]
Deduci t1:
[tex]\tt v_{3} \times t-v_{3}\times t_{1}=v_{2} \times t-v_{1}\times t_{1}\\ \\
v_{3}\times t-v_{2}\times t=v_{3} \times t_{1}-v_{1} \times t_{1}\\ \\
t \times(v_{3}-v_{2})=t_{1}\times(v_{3}-v_{1})\\ \\
t_{1}=\frac{t \times(v_{3}-v_{2})}{v_{3}-v_{1}}[/tex]
