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 2.5 kmph, find his average speed for the total journey?
Choose the correct choice from the following options
A) 3.00kmph  B) 2.50kmph  C) 3.50kmph  D) 3.11kmph  E) 3.90kmph
M = 4.5   S = 2.5   3.11kmphS = 7   US = 2   AS = (2 * 7 * 2) /9 = 3.11   Answer:3.11kmph
<result>D</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 2.5 kmph, find his average speed for the total journey?