A boat can move upstream at 25 kmph and downstream at 39 kmph, then the speed of the current is?  Select: A) 5 B) 6 C) 7 D) 54 E) 3
US = 25   DS = 39   M = (39 - 25)/2= 
<gadget id="calculator">(39 - 25)/2</gadget>
<output>7</output>
7.Answer:7
<result>C</result>
A boat can move upstream at 25 kmph and downstream at 39 kmph, then the speed of the current is?