A boat can move upstream at 15 kmph and downstream at 35 kmph, then the speed of the current is? Choose the correct choice from the following.
A) 5 B) 6 C) 7 D) 10 E) 32
US = 15   10S = 35   M = (35 - 15)/2= 
<gadget id="calculator">(35 - 15)/2</gadget>
<output>10</output>
10   Answer: 10
<result>D</result>
A boat can move upstream at 15 kmph and downstream at 35 kmph, then the speed of the current is?