A boat can move upstream at 50 kmph and downstream at 100 kmph, then the speed of the current is?	Pick one
A) 10  B) 45  C) 25  D) 40  E) 20
US = 50   DS = 100   M = (100- 50)/2= 
<gadget id="calculator">(100- 50)/2</gadget>
<output>25</output>
25   Answer:25
<result>C</result>
A boat can move upstream at 50 kmph and downstream at 100 kmph, then the speed of the current is?