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Let speed of boat in still water and speed of boat in upstream be ‘13x’ km/h and ‘10x’ km/h, respectively. Speed of stream = 13x – 10x = 3x km/h Speed of boat in downstream = 13x + 3x = 16x km/h So, 16x = 320/5 = 64 Or, x = 4 Speed of boat in still water = 13 × 4 = 52 km/h Desired time = 13/52 = 15 minutes
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