A man whose speed is 5.5 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) 3kmph
B) 4kmph
C) 5.1kmph
D) 6kmph
E) 7kmph
M = 5.5   S = 1.5   DS = 7   US = 4   AS = (2 * 7 * 4) /11 = 4   Answer:5.1kmph
<result>C</result>
A man whose speed is 5.5 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?