Let speed of boat in still water and speed of boat in upstream be ‘8x’ km/h and ‘5x’ km/h, respectively. Speed of stream = 8x – 5x = 3x km/h Speed of boat in downstream = 8x + 3x = 11x km/h So, 11x = 440/5 = 88 Or, x = 8 Speed of boat in still water = 8 × 8 = 64 km/h Desired time = 32/64 = 30 minutes
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