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A train is 250 m long. If the train takes 50 seconds to cross a tree by the railway line, then the speed of the train in km/hr is:
Length of train = 250 m and time taken = 50 seconds
=> Speed = $$\frac{250}{50}=5$$ m/s
Thus, speed (in km/hr) = $$5\times\frac{18}{5}=18$$ km/hr
=> Ans - (C)
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