A man whose speed is 3.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey? Select:
A) 2.0
B) 2.5
C) 3.0
D) 2.1
E) 4.0
M = 3.5   S = 1.5   DS = 5   US = 2   AS = (2 * 5 * 2) /5= 
<gadget id="calculator">(2 * 5 * 2) /5</gadget>
<output>4</output>
4   Answer: 4.0
<result>E</result>
A man whose speed is 3.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?