A boat can move upstream at 35 kmph and downstream at 75 kmph, then the speed of the current is?
A. 5 kmph Select
A) 15	B) 12	C) 17	D) 13	E) 20
US = 35   DS = 75   M = (75- 35)/2= 
<gadget id="calculator">(75- 35)/2</gadget>
<output>20</output>
20   Answer:20
<result>E</result>
A boat can move upstream at 35 kmph and downstream at 75 kmph, then the speed of the current is?
A. 5 kmph