7 seconds to pass a pole:

Time taken by the train to cover a distance that equals to its own length = 7 seconds25 seconds to cross a train 378 mtrs long:

Time taken by the train to cover a distance equal to the sum of its own length and 378 mtrs = 25 secondsTherefore,

Time taken by the train to cover only 378 mtrs = 25 - 7 seconds = 18 secondsSpeed = \(\frac{378}{18}\) mtrs/second

=> \(\frac{378}{18} * \frac{18}{5}\) km/hour

=> 75.6 km/hour

BPS: Remeber this for quick conversions:

To convert speed in m/sec to km/h, multiply by 18/5

To convert speed in km/h to m/sec, multiply by 5/18
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One Kudos for an everlasting piece of knowledge is not a bad deal at all...

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Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.

-Mark Twain