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A 200-metre train at 36 km/h crosses a 100-metre platform. How long does it take?
A$20$ seconds
B$25$ seconds
C$28$ seconds
D$30$ seconds
Answer & Solution
Correct answer: D. $30$ seconds
36 km/h = 10 m/s. Total distance covered = 200 + 100 = 300 m. Time = 300/10 = 30 seconds. Crossing a platform sums train length and platform length.
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