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ATQ, Let the speed of the stream = t km/h Speed of the boat in still water = 2t km/h Upstream speed of the boat = 2t – t = t km/h Downstream speed of the boat = 2t + t = 3t km/h Difference in Speed: - 3t - t = 2t = 16 km/h, so, t = 8 km/h Calculate the time for each distance 'q': 
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