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Let speed of the boat in still water be ‘3x’ km/h. Speed of the boat in upstream = 3x ÷ 3 = ‘x’ km/h Speed of the stream = 3x – x = ‘2x’ km/h Speed of the boat in downstream = 3x + 2x = ‘5x’ km/h ATQ; (25/25) × 60 = 60 So, 5x = 60 Or, x = 12 So, speed of the boat in still water = 3 × 12 = 36 km/h
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