Two trains are moving towards each other at speeds of 72 and 54 km / h. The passenger on the first train notices that the second train passes by him for 14 seconds. How long is the second train?
The speed of the first train is 72 km / h or 20 m / s.
The speed of the second train is 54 km / h or 15 m / s.
The total speed of oncoming trains is 35 m / s.
The train passed by the passenger for 14 seconds.
Hence its length:
S = V * T = 35 * 14 = 490 meters.
Answer: the length of the train is 490 meters.
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