The speed of the stream is 10 km/h. Boat ‘A’ covers 60 km distance against the stream in 6 hours and boat ‘B’ covers 120 km distance against the stream in 4 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 = 60/6 = 10 km/h Speed of boat ‘B’ upstream = 120/4 = 30 km/h Speed of the boat ‘A’ in still water = 10 + 10 = 20 km/h Speed of the boat ‘B’ in still water = 30 + 10 = 40 km/h Required percentage = (40/20) × 100 = 200%
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