A train takes 10 seconds to cross a pole and 20 seconds to cross a platform of length 200 m. What is the length of the train?
Correct Answer: Description for Correct answer:
Let 'L' be the length of train
A train takes 10 sec to cross a pole \( \Large S_{T} = \frac{L}{10} \)... (i)
and same train takes 20 sec to cross a platform of length 200 m
\( \Large S_{T} = \frac{L+200}{20} \)...(ii)
Solving equation (i) and (ii) we get
\( \Large \frac{L}{10} = \frac{L + 200}{20} \)
2L = L + 200
L = 200m
Hence length of train is 200 m
Option (D)is correct
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