A man whose speed is 4 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1 kmph, find his average speed for the total journey?
Select.
A) 5	B) 4	C) 4.5	D) 3.75	E) 3
M = 4   S = 1   3.75S = 5   US = 3   AS = (2 * 5 * 3) /8= 
<gadget id="calculator">(2 * 5 * 3) /8</gadget>
<output>15/4 = around 3.75</output>
3.75   Answer: 3.75
<result>D</result>
A man whose speed is 4 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1 kmph, find his average speed for the total journey?