A man can swim in still water at 6 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?  Choose the correct answer:  A) 2  B) 1.4  C) 1.2  D) 1.5  E) 1.1
M = 6   S = x   DS = 6 + x   US = 6 + x   6 + x = (6 - x)2   6 + x = 12 -2x   3x = 6   x = 2   2nswer: 2
<result>A</result>
A man can swim in still water at 6 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?