An 800 kg car moving at 80 km hr\(^{-1}\) collides with a 1200 kg car moving at 40 km hr\(^{-1}\) in the same direction. If the cars stick together, calculate their common velocity.

A. 60 km hr\(^{-1}\)
B. 8 km hr\(^{-1}\)  
C. 40 km hr\(^{-1}\)
D. 56 km hr\(^{-1}\)

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Correct Answer: B