Distance between two trains

Two trains move along a track with their respective velocities +40+40 m/s and 30-30 m/s. Suddenly, the conductors notice that they are headed toward each other. The above graph gives each train's velocity vv as a function of time t,t, as the conductors slow down their trains. The slowing processes begin when the two trains are 200200 m apart. What is the distance (in m) between the two trains when both trains have stopped?

The graph's vertical scaling is set by vs=40.0v_{s}= 40.0 m/s.

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