Correct Answer: 600 m
Explanation:
Let the speed of the train be V
According to the question.
(V + 10) x 12 = (V + 20) x 10
⇒ 6V + 60 = 5V + 100
⇒ x = 100 - 60 = 40 m/s
∴ Length of the train = (V + 10) x 12
= (40 + 10) x 12 = 600 m
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