Question
Boat βAβ can cover 120 km in still water in 12
hours. In still water, if the ratio of the speed of boat βAβ to that of βBβ is 5:4 and the speed of stream is 3 km/hr then find the time taken by boat βBβ to cover the 264 km in downstream.Solution
Speed of boat βAβ in still water = 120/12 = 10 km/hr Speed of boat βBβ in still water = 10 Γ (4/5) = 8 km/hr Downstream speed of boat βBβ = 8 + 3 = 11 km/hr Time taken by boat βBβ to cover 264 km in downstream = 264/11 = 24 hours
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