Two train cars on a frictionless track have a completely inelastic collision in which they "couple" together. The car on the left has mass 16.1 tons and velocity 16.1 m/s to the right; the other train has mass 10.8 tons and velocity 13.1 m/s to the left.  After the collision, what is the velocity of the pair fo cars? Your answer should be in tons times m/s, but you don't need to write the units, just the number. "To the right" is taken as positive, so make sure you have the sign right. (If your answer is positive, you don't need to write a "+" sign.)

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