A boat can move upstream at 30 kmph and downstream at 35 kmph, then the speed of the current is?	Pick: A) 5 B) 6 C) 7 D) 8 E) 2.5
US = 30   DS = 35   M = (35 - 30)/2= 
<gadget id="calculator">(35 - 30)/2</gadget>
<output>5/2 = around 2.5</output>
2.5   Answer: 2.5
<result>E</result>
A boat can move upstream at 30 kmph and downstream at 35 kmph, then the speed of the current is?