Let speed of boat in still water and speed of boat in upstream be ‘5x’ km/h and ‘4x’ km/h, respectively. Speed of stream = 5x – 4x = x km/h Speed of boat in downstream = 5x + x = 6x km/h So, 6x = 216/3 => x = 12 Speed of boat in still water = 5 × 12 = 60 km/h Desired time = 30/60 x 60 = 30 minutes
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