A man can swim in still water at 5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?  Choose the correct option
A) 1.78 B) 1.667 C) 1.15 D) 1.5 E) 1.2
M = 5   S = x   DS = 5 + x   US = 5 - x   5 + x = (5 - x)2   5 + x = 10 -2x   3x = 5   x = 1.667   Answer:1.667
<result>B</result>
A man can swim in still water at 5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?