A man whose speed is 4.5 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?
Choose the correct choice from the following choices:
A) 8
B) 4
C) 9
D) 6
E) 1
M = 45   S = 1.5   DS = 6   US = 3   AS = (2 * 6 * 3) /9= 
<gadget id="calculator">(2 * 6 * 3) /9</gadget>
<output>4</output>
4   Answer: 4
<result>B</result>
A man whose speed is 4.5 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?