A boat can move upstream at 25 kmph and downstream at 45 kmph, then the speed of the current is? Answers:
A) 10 kmph B) 7 kmph C) 8 kmph D) 9 kmph E) 4 kmph
US = 25   DS = 45   M = (45 - 25)/2= 
<gadget id="calculator">(45 - 25)/2</gadget>
<output>10</output>
10   10 kmphnswer:10 kmph
<result>A</result>
A boat can move upstream at 25 kmph and downstream at 45 kmph, then the speed of the current is?