A man can row downstream at 20 kmph and upstream at 10 kmph. Find the speed of the man in still water and the speed of stream respectively?	Choices:
A) 3
B) 5
C) 6
D) 4
E) 9
Let the speed of the man in still water and speed of stream be x kmph and y kmph respectively.   Given x + y = 20 --- (1)   and x - y = 10 --- (2)   From (1) &amp; (2) 2x = 30 =&gt; x = 15, y = 5. Answer: 5
<result>B</result>
A man can row downstream at 20 kmph and upstream at 10 kmph. Find the speed of the man in still water and the speed of stream respectively?