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A train crosses a pole in $12$ seconds and a bridge of length $170$ meters in $36 \mathrm{~sec}$. The speed of the train is ________

  1. $30.75 \mathrm{~km} / \mathrm{h}$
  2. $32.45 \mathrm{~km} / \mathrm{h}$
  3. $25.5 \mathrm{~km} / \mathrm{h}$
  4. $10.8$ $\mathrm{~km} / \mathrm{h}$
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