Question
The speed of the stream is 10 km/h. Boat βAβ covers
60 km distance against the stream in 6 hours and boat βBβ covers 120 km distance against the stream in 4 hours. The speed of boat βBβ in still water is how much percent of the speed of boat βAβ in still water?Solution
Speed of boat βAβ upstream = 60/6 = 10 km/h Speed of boat βBβ upstream = 120/4 = 30 km/h Speed of the boat βAβ in still water = 10 + 10 = 20 km/h Speed of the boat βBβ in still water = 30 + 10 = 40 km/h Required percentage = (40/20) Γ 100 = 200%
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