Calculating Final Speed of Sled with Bobsledders Jumping In

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Homework Statement

Four 63kg bobsledders psuh their sled which has a mass of 210kg when empty. They start to push over a flat frictionless surface at an initial speed of 3m/s. At intervals of 2s, each bobsledder sprints forwards at a speed of 2m/s faster than the sled's current speed and then jumps in.

What is the sled's final speed once everyone is in?

Homework Equations

p'=p

The Attempt at a Solution

m1v1=v(mtotal)
m1 is sled's mass.

 

[Spinnor]

V = 3 + 2 + 2 + 2 + 2 + 2 + 2

I wrote down too many twos, how many?