A man is sitting in a train which is moving with a velocity of 60 km/hour. His speed with respect to the train is:

The speed of an object is always measured relative to a specific frame of reference. In this scenario, the man is sitting inside the train, meaning he is stationary relative to the train's interior. According to the principles of relative velocity, the speed of an object with respect to a frame is the difference between the object's speed and the frame's speed relative to the ground. Since both the man and the train are moving at the same velocity of 60 km/h relative to the ground, their relative speed is zero. Even though the train is moving at a high speed relative to the tracks or a stationary observer, the man and the train share the same frame of reference. Therefore, his speed with respect to the train is zero, as there is no change in position between him and the train over time.