A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is? Choose the correct choice.
A) 5  B) 6  C) 7  D) 7  E) 1
US = 25   DS = 35   M = (35 - 25)/2= 
<gadget id="calculator">(35 - 25)/2</gadget>
<output>5</output>
5   5nswer: 5
<result>A</result>
A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?