The speed of the stream is 10 km/h. Boat ‘A’ covers 150 km distance against the stream in 6 hours and boat ‘B’ covers 108 km distance against the stream in 6 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?
Speed of boat ‘A’ upstream = 150/6 = 25 km/h Speed of boat ‘B’ upstream = 108/6 = 18 km/h Speed of the boat ‘A’ in still water = 25 + 10 = 35 km/h Speed of the boat ‘B’ in still water = 18 + 10 = 28 km/h Required percentage = (28/35) × 100 = 80%
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