A train 150 m long is running at 54 km/h. How long will it take to cross a pole?
10 sec
Speed is converted from 54 km/h to metres per second as 54 times 5/18, which equals 15 m/s. The time to cross a stationary pole equals the train's length divided by its speed, so time is 150/15, which is 10 seconds.
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