The train, moving evenly at a speed of 57 km / h, passes by a pedestrian walking parallel to the tracks
| January 24, 2021 | education
The train, moving evenly at a speed of 57 km / h, passes by a pedestrian walking parallel to the tracks at a speed of 3 km / h towards the train, in 18 seconds. Find the length of the train.
1. We calculate the speed of convergence of a train and a pedestrian:
57 + 3 = 60 km / h.
2. We translate the found speed from kilometers per hour to meters per second:
60 km / h = (60 x 1000) / 3600 = 100/6 = 50/3 m / s.
3. We calculate the length of the train:
50/3 x 18 = 300 meters.
Answer: the length of the train is 300 meters.
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