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 the stream is:
Choose the correct answer
A) 1:2 B) 2:5 C) 6"2 D) 3:1 E) 4:7
Explanation:   Let speed upstream=x   hen, speed downstream =2x   Speed in still water =2x+x/2   Speed of the stream=2x-x/2   Speed in still water : Speed of the stream=3x/2:x/2=3:1   Answer:3:1
<result>D</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 the stream is: