Question
Boat βAβ can cover 160 km in still water in 8 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 5 km/hr then find the time taken by boat βBβ to cover the 350 km in downstream.Solution
Speed of boat βAβ in still water = 160/8 = 20 km/hr Speed of boat βBβ in still water = 20 Γ (3/2) = 30 km/hr Downstream speed of boat βBβ = 30 + 5 = 35 km/hr Time taken by boat βBβ to cover 350 km in downstream = 350/35 = 10 hours
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