Question
Boat ‘A’ can cover 250 km in still water in 10
hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:4 and the speed of stream is 5 km/hr then find the time taken by boat ‘B’ to cover the 275 km in downstream.Solution
Speed of boat ‘A’ in still water = 250/10 = 25 km/hr Speed of boat ‘B’ in still water = 25 × (4/5) = 20 km/hr Downstream speed of boat ‘B’ = 20 + 5 = 25 km/hr Time taken by boat ‘B’ to cover 275 km in downstream = 275/25 = 11 hours
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