A boat can move upstream at 20 kmph and downstream at 40 kmph, then the speed of the current is? Pick: A) 5 B) 8 C) 10 D) 3 E) 2
US = 20   DS = 40   M = (40- 20)/2= 
<gadget id="calculator">(40- 20)/2</gadget>
<output>10</output>
10   Answer:10
<result>C</result>
A boat can move upstream at 20 kmph and downstream at 40 kmph, then the speed of the current is?