a boat covers a distance of 30 km downstream in 2 hours while it takes 6 hours to cover the same distance upstream.How much time the boat will take to cover 90 km in still water
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Speed of boat downstream=30/2=15km/hr Speed of boat upstream =30/6=5km/hr Speed of boat in still water =1/2(15+5)=10km/hr Time taken to cover 90km in still water =90/10=9 hrs
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