A man can swim in still water at 12 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is? Choose the correct choice from the following choices:  A) 4  B) 4.2  C) 5.3  D) 1.5  E) 5.2
M = 12   S = x   DS = 12 + x   US = 12 - x   12 + x = (12 - x)2   12 + x = 24 -2x   3x = 12   x = 4   4nswer:4
<result>A</result>
A man can swim in still water at 12 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?