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A train 200 m long crosses a platform 100 m long in 12 seconds. Find the train's speed in km/h.
A72
B80
C90
D100
Answer & Solution
Correct answer: C. 90
1. Total distance = 200 + 100 = 300 m.
2. Speed = 300 / 12 = 25 m/s.
3. To km/h: 25 × 18/5 = 90 km/h.
_Source: jkchrome TSD QB, p.3 — train and platform_
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