A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?	Choose one:	A) 5	B) 6	C) 8	D) 4	E) 2
US = 25   DS = 35   M = (35 - 25)/2= 
<gadget id="calculator">(35 - 25)/2</gadget>
<output>5</output>
5 5nswer:5
<result>A</result>
A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?