A man can row his boat with the stream at 12 km/h and against the stream in 4 km/h. The man's rate is?  Pick.
A) 1 kmph  B) 4 kmph  C) 98 kmph  D) 6 kmph  E) 4 kmph
DS = 12   S = ?   S = (12 - 4)/2= 
<gadget id="calculator">(12 - 4)/2</gadget>
<output>4</output>
4 kmph   Answer: 4 kmph
<result>E</result>
A man can row his boat with the stream at 12 km/h and against the stream in 4 km/h. The man's rate is?