A train, $140$ metres long, moves at the rate of $36\,\mathrm{kmph}$. How long will it take to pass a certain telegraph pole?

To pass a pole, the train must cover its own length only. Convert $36\,\mathrm{kmph}$ to m/s: $36\times \frac{5}{18}=10\,\mathrm{m/s}$. Therefore time $=\frac{140}{10}=14$ seconds. The height of the pole does not matter.