Question
Boat ‘A’ can cover 120 km in still water in 12
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 3 km/hr then find the time taken by boat ‘B’ to cover the 264 km in downstream.Solution
Speed of boat ‘A’ in still water = 120/12 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (4/5) = 8 km/hr Downstream speed of boat ‘B’ = 8 + 3 = 11 km/hr Time taken by boat ‘B’ to cover 264 km in downstream = 264/11 = 24 hours
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