Question
Boat ‘A’ can cover 240 km in still water in 12
hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 4:7 and the speed of stream is 2 km/hr then find the time taken by boat ‘B’ to cover the 814 km in downstream.Solution
Speed of boat ‘A’ in still water = 240/12 = 20 km/hr Speed of boat ‘B’ in still water = 20 × (7/4) = 35 km/hr Downstream speed of boat ‘B’ = 35 + 2 = 37 km/hr Time taken by boat ‘B’ to cover 814 km in downstream = 814/37 = 22 hours
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