Question

train a moving at 30km/hr passes station at 08:00.A train B travelling the same way at 45km/hr passes this station at 08:30, at what time will train B overtake A

please can someone explain to me
between 8:00 and 8:30, A has gone 15 km

The speed difference B-A = 15 km/hr

So, since B is 15km behind A at 8:30, it will take 1 hour to make up the distance.

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