Two trains are heading directly toward each other on adjacent tracks.
Roger is on one train traveling at 100 metres per second (mps) and Greg is on another train traveling at 200mps.
Roger has a lamp. The speed of the light from his lamp is 299,792,458mps.
Additionally, Roger is also running at a velocity of 10mps on his train in the direction that the train is travelling, in the direction of Greg.
At what total speed is the light from Roger's lamp traveling toward Greg?
X