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
(2) 9 hrs
(3) 15 hrs
(4) None of these
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