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; (30/15) × 60 = 120 So, 5x = 120 Or, x = 24 So, speed of the boat in still water = 3 × 24 = 72 km/h
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