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31. A man row downstream at 12 km/h and upstream at | 31, एक आदमी भी8 km/h. What is the speed of man in still water? विपरीत दिशा मेंपानी में आदमी(A) 12 km/h(B) 10 km/h(A) 12 kin/h(C) 8 km/h(D) 9 km/h(C) 8 km/h2 Fauation 2 + y2 =is2- समीकरण ४

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Answer:b) 10km/hr

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