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Upstream speed = 245/7 = 35 km/h Downstream speed = 477/9 = 53 km/h Speed of boat in still water = (35 + 53)/2 = 44 km/h Speed of stream = (53 – 35)/2 = 9 km/h Increased speed of boat in still water = 44 + 4 = 48 km/h Decreased speed of stream = 9 – 2 = 7 km/h Required time taken = 410/(48 – 7) + 495/(48 + 7) = 10 + 9 = 19 hours
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