A man can swim in still water at 1.5 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) 1.7
B) 0.5
C) 1.1
D) 1.5
E) 1.9
M = 1.5   S = x   DS = 1.5 + x   US = 1.5 + x   1.5 + x = (1.5 - x)2   1.5 + x = 3 -2x   3x = 1.5   x = 0.5   Answer:0.5
<result>B</result>
A man can swim in still water at 1.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?