A boat can move upstream at 25 kmph and downstream at 45 kmph, then the speed of the current is? Choose the correct option
A) 5	B) 6	C) 7	D) 4	E) 10
US = 25   DS = 45   M = (45 - 25)/2= 
<gadget id="calculator">(45 - 25)/2</gadget>
<output>10</output>
10   Answer: 10
<result>E</result>
A boat can move upstream at 25 kmph and downstream at 45 kmph, then the speed of the current is?