The conductor is moving in the opposite direction the train is moving in. The train is moving 100km/h relative to the ground and the conductor is moving 5km/h relative the the ground, but in the OPPOSITE direction. You must subtract the two velocity vectors to get 95km/h. NOTE: If the conductor were running 100km/h towards the back of the train his speed would be zero relative to the ground.

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The answer you're looking for is 95 km/hr.

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