A man can swim in still water at 4 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is? Options
A) 1.3
B) 7.5
C) 2.25
D) 1.5
E) 4
M = 4   S = x   DS = 4 + x   US = 4 - x   4 + x = (4 - x)2   4 + x = 8 -2x   3x = 4   x = 1.3   1.3NSWER:1.3
<result>A</result>
A man can swim in still water at 4 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?