- A140 m
- B180 m
- C126 m
- D200 m
Step-by-Step Solution
The extra 21 s is for the 420 m platform → speed m/s. Length m. (126 m wrongly uses as the speed.)
Answer: B) 180 m
A train takes 9 seconds to pass a pole and 30 seconds to pass a 420 m platform. How long is the train?
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