Discussion
A train having length 150 m passes a platform of 550 m length. The time taken for it is 56 seconds. In how much time will this train take to pass the platform of 250 m length?
Answer: A
Find the speed from the first crossing.
\[ v = \frac{150 + 550}{56} = \frac{700}{56} = 12.5 \text{ m/s} \]
\[ t = \frac{150 + 250}{12.5} = \frac{400}{12.5} = 32 \text{ seconds} \]
The train's own length must be added to both platform lengths; leaving it out of the second would give 20 seconds.
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