A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?	Choose the most appropriate option:
A) 5 kmph
B) 7 kmph
C) 8 kmph
D) 9 kmph
E) 4 kmph
US = 25   DS = 35   M = (35 - 25)/2= 
<gadget id="calculator">(35 - 25)/2</gadget>
<output>5</output>
5   5 kmphnswer:5 kmph
<result>A</result>
A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?