The Traveller and the Train, Mind Exercise

Now Briquinex takes you on a train excursion. You are told that a traveler who traveled on another train which had a speed of 40 km / h, observed through the window as a fast train, that went in the opposite direction passed him in 3 seconds. Your exercise is to determine the speed of the fast train knowing that its length is 75m.
photo source: wikipedia

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