Let speed of boat in still water and speed of boat in upstream be ‘9x’ km/h and ‘4x’ km/h, respectively. Speed of stream = 9x – 4x = 5x km/h Speed of boat in downstream = 9x + 5x = 14x km/h So, 14x = 560/5 = 112 Or, x = 8 Speed of boat in still water = 9 × 8 = 72 km/h Desired time = 24/72 = 20 minutes
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