Question
Boat ‘A’ can cover 100 km in still water in 10
hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 2:3 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 378 km in downstream.Solution
Speed of boat ‘A’ in still water = 100/10 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (3/2) = 15 km/hr Downstream speed of boat ‘B’ = 15 + 3 = 18 km/hr Time taken by boat ‘B’ to cover 378 km in downstream = 378/18 = 21 hours
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