Two rifles are fired from the same palce...

Two rifles are fired from the same palce at a difference of 11 min. 45 seconds. But a man who is coming towards the same place in a train hears the second sound after 11 minutes. Find the speed of the train (Assuming speed of sound = 330 m/s).

72 km/h

36 km/h

81 km/h

108 km/h

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