a train running at speed of 120 km/h crosses a signal post in 15 sec. what is the length of the train in metere
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In this question the speed of train is in km/hr but time taken by a train to cross a pole is in 'sec'.
So, first we convert the unit of speed.
Conversion, 1km/hr = (5/18) m/sec
=> 120 km/hr = 120×5/18 =(100/3) m/sec
Now, length of train = speed of train × time taken by it to cross the pole = (100/3)×9 =300m
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