A boat has an upstream speed of at 50 kmph and downstream at 80 kmph, and then find the speed of the boat in still water?	Choose the most appropriate option:  A) 65  B) 60  C) 75  D) 70  E) 90
US = 25   DS = 35   M = (50 +80)/2= 
<gadget id="calculator">(50 +80)/2</gadget>
<output>65</output>
65   65nswer:65
<result>A</result>
A boat has an upstream speed of at 50 kmph and downstream at 80 kmph, and then find the speed of the boat in still water?