Question
The speed of the stream is 15 km/h. Boat ‘A’ covers
140 km distance against the stream in 4 hours and boat ‘B’ covers 105 km distance against the stream in 5 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 = 140/4 = 35 km/h Speed of boat ‘B’ upstream = 105/5 = 21 km/h Speed of the boat ‘A’ in still water = 35 + 15 = 50 km/h Speed of the boat ‘B’ in still water = 21 + 15 = 36 km/h Required percentage = (36/50) × 100 = 72%
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