Discussion
A 1200 m long train crosses a tree in 120 sec, how much time will I take to pass a platform 700 m long?
Answer: B
A tree is a point, so the first crossing gives the speed.
\[ v = \frac{1200}{120} = 10 \text{ m/s} \]
\[ t = \frac{1200 + 700}{10} = 190 \text{ seconds} \]
Timing only the platform's 700 m would give 70 seconds; the train's own length is part of the crossing.
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