A fish can go upstream at 35 kmph and downstream at 55 kmph, and then find the speed of the fish in still water?  Choose one.
A) 45	B) 55	C) 35	D) 65	E) 70
US = 35   DS = 55   M = (35 + 55)/2= 
<gadget id="calculator">(35 + 55)/2</gadget>
<output>45</output>
45   45nswer:45
<result>A</result>
A fish can go upstream at 35 kmph and downstream at 55 kmph, and then find the speed of the fish in still water?