Question
The speed of the stream is 15 km/h. Boat ‘A’ covers
100 km distance against the stream in 4 hours and boat ‘B’ covers 90 km distance against the stream in 3 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 = 100/4 = 25 km/h Speed of boat ‘B’ upstream = 90/3 = 30 km/h Speed of the boat ‘A’ in still water = 25 + 15 = 40 km/h Speed of the boat ‘B’ in still water = 30 + 15 = 45 km/h Required percentage = (45/40) × 100 = 112.5%
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