Question
The speed of the stream is 12 km/h. Boat ‘A’ covers
120 km distance against the stream in 6 hours and boat ‘B’ covers 120 km distance against the stream in 2 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?Solution
Speed of boat ‘A’ upstream = 120/6 = 20 km/h Speed of boat ‘B’ upstream = 120/2 = 60 km/h Speed of the boat ‘A’ in still water = 20 + 12 = 32 km/h Speed of the boat ‘B’ in still water = 60 + 12 = 72 km/h Required percentage = (72/32) × 100 = 225%
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