Question
Boat βAβ can cover 100 km in still water in 10
hours. In still water, if the ratio of the speed of boat βAβ to that of βBβ is 2:3 and the speed of stream is 3 km/hr then find the time taken by boat βBβ to cover the 378 km in downstream.Solution
Speed of boat βAβ in still water = 100/10 = 10 km/hr Speed of boat βBβ in still water = 10 Γ (3/2) = 15 km/hr Downstream speed of boat βBβ = 15 + 3 = 18 km/hr Time taken by boat βBβ to cover 378 km in downstream = 378/18 = 21 hours
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