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 option.
A) 4 B) 5 C) 6 D) 7 E) 8
M = 45   S = 1.5   DS = 6   US = 3   4S = (2 * 6 * 3) /9= 
<gadget id="calculator">(2 * 6 * 3) /9</gadget>
<output>4</output>
4   4nswer: 4
<result>A</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?