A man can swim in still water at 7.5 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 answers.
A) 3
B) 2.5
C) 2.25
D) 1.5
E) 4
M = 7.5   S = x   DS = 7.5 + x   US = 7.5 - x   7.5 + x = (7.5 - x)2   7.5 + x = 15 -2x   3x = 7.5   x = 2.5   ANSWER:2.5
<result>B</result>
A man can swim in still water at 7.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?