1. a km / hr = (a * 5/18) m/s.
2. a m / s = (a * 18/5) km / hr.
3. Time taken by a train of length / meters to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover 1 meters.
4. Time taken by a train of length / meters to pass a stationary obje...