17. A train is 125 m long. If the train takes 30 s to cross a tree by the railway line, then the speed of the train is (2) 15 km/h (4) 12 km/h (1) 14 km/h (3) 16 km/h .
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Correct Answer: B) 15 km/hr.
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b will be the answer mark me brainliest first
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