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From (I), let the Upstream Speed = x km/h, Let the Downstream Speed = y km/h 460/x + 460/y = 46 1/x + 1/y = 1/10 From (II), we will get, y = 50, x = (50 × 10)/(50 – 10) = 12.5 km/h From (III), we will get, x = 25/2 = 12.5 y = (12.5 × 10)/(12.5 – 10) = 50 km/h Therefore Speed of Stream will be = (50 – 12.5)/2 = 18.75 km/h So, Any two statements are sufficient to answer the question
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