Wednesday, July 1, 2015

#Solve #Puzzle

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?
(1) 6 hrs   
(2) 9 hrs
(3) 15 hrs   
(4) None of these

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