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A boat takes 120min less to travel 30km downstream than to travel the same distance upstream.If the speed of the boat in still water

A boat takes 120min less to travel 30km downstream than to travel the same distance upstream.If the speed of the boat in still water is 8kmph then the speed of the stream is A)2kmph B)8kmph C)3kmph D)4kmph E)None of these

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