Question
Boat βAβ can cover 180 km in still water in 12
hours. In still water, if the ratio of the speed of boat βAβ to that of βBβ is 3:4 and the speed of stream is 3 km/hr then find the time taken by boat βBβ to cover the 253 km in downstream.Solution
Speed of boat βAβ in still water = 180/12 = 15 km/hr Speed of boat βBβ in still water = 15 Γ (4/3) = 20 km/hr Downstream speed of boat βBβ = 20 + 3 = 23 km/hr Time taken by boat βBβ to cover 253 km in downstream = 253/23 = 11 hours
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