If I am on a train (hypothetically) moving at the speed of light (c) and I start running at a speed of 5 km/hr in the same direction as the train, am I now moving at a speed of c + 5 km/hr?
If I am in a subway train moving at the speed of light, and I start running 5 km/hr in the same direction in the train, am I running c+5 km/hr?
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