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Total Distance the train needs to cover,
120 m+ 130 m (platform length) = 250 m.
Speed of the train is,
120 m/ 12 sec = 10 m/sec. (s=D/t)
Now, to cover 250 meters at 10 meters per second, the train take,
250 m / 10 m/sec = 25 sec.
Therefore,
It will take 25 seconds to pass the platform.
Total Distance the train needs to cover,
120 m+ 130 m (platform length) = 250 m.
Speed of the train is,
120 m/ 12 sec = 10 m/sec. (s=D/t)
Now, to cover 250 meters at 10 meters per second, the train take,
250 m / 10 m/sec = 25 sec.
Therefore,
It will take 25 seconds to pass the platform.