how long will a boy sitting near the window of a train travelling at 54 km/hr see a train passing by in the opposite direction with a speed of 36 km/hr. the length of the slow-moving train is 100m
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The speeds should first be converted to meters per second.
54 × 5/18 = 15m/s
36 × 5/18 = 10m/s
The relative speed of two approaching bodies is the sum of the two speeds.
In this case we have :
Relative speed :
15 + 10 = 25m/s
Relative distance is 100 m
Time = Distance /speed
100/25 = 4 seconds
Time is therefore 4 seconds
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