Train $A$ is moving along two parallel rail tracks towards north with speed $72 \ km/h$ and train $B$ is moving towards south with speed $108 \ km/h$. The velocity of train $B$ with respect to $A$ and the velocity of the ground with respect to $B$ are (in $ms^{-1}$):
- A$-50$ and $30$
- B$-30$ and $50$
- C$-50$ and $-30$
- D$50$ and $-30$
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