KöMaL 2009 C1005
An intercity train overtakes a freight train travelling on a parallel track. On its way back, the intercity also passes the freight train travelling in the opposite direction. The ratio of the speed of the IC to that of the freight train equals the ratio of the time of overtaking to the time of passing each other in opposite directions. By what factor is the IC faster than the freight train if each train travels at a constant speed?
Official text KöMaL. Quoted with source.
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