A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat in still water and stream is	Select.
A) 3:1	B) 1:3	C) 2:4	D) 4:2	E) None of these
Explanation:   Let speed downstream = x kmph   Then Speed upstream = 2x kmph   So ratio will be,   (2x+x)/2 : (2x-x)/2   =&gt; 3x/2 : x/2 =&gt; 3:1   Option 3:1
<result>A</result>
A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat in still water and stream is