Question
Boat ‘A’ covers 200 km in downstream in 10 hours. If
the speed of stream is 2 km/hr then find the time taken by boat ‘A’ to cover 160 km in upstream.Solution
Downstream speed of boat ‘A’ = 200/10 = 20 km/hr Speed of boat ‘A’ in still water = 20 – 2 = 18 km/hr Upstream speed of boat ‘A’ = 18 – 2 = 16 km/hr Time taken by boat ‘A’ to cover 160 km in upstream = 160/16 = 10 hours
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