A boat can move upstream at 20 kmph and downstream at 34 kmph, then the speed of the current is? Choose the correct choice from the following answers
A) 7	B) 6	C) 8	D) 4	E) 2
US = 20   DS = 34   M = (34 - 20)/2= 
<gadget id="calculator">(34 - 20)/2</gadget>
<output>7</output>
7 7nswer:7
<result>A</result>
A boat can move upstream at 20 kmph and downstream at 34 kmph, then the speed of the current is?