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**1. The problem statement, all variables and given/known data**

I am given the location of 3 points in space:

Z1= X_1+Y_1i

Z2= X_2+Y_2i

Z3= X_3+Y_3i

and the velocity of two points:

V_1= X_1+Y_1i

V_2= X_2+Y_2i

How do I find V3?

**2. Relevant equations**

V_1/2= V_1-V_2

V_3= V1+V_3/1

V_2/1= V_2-V_1

**3. The attempt at a solution**

I have the equations, but I just can't seem to figure out how to relate V_3 with V_2 and V_1. Can anyone help?