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  Choices
A) 3 : 1  B) 1 : 3  C) 2 : 4  D) 4 : 2  E) none of these

Rationale: "explanation : let speed downstream = x kmph then speed upstream = 2 x kmph so ratio will be , ( 2 x + x ) / 2 : ( 2 x - x ) / 2 = > 3 x / 2 : x / 2 = > 3 : 1 option a"
Answer: A