A man whose speed is 3.5 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?
Pick:
A) 2.0kmph
B) 2.3kmph
C) 2.85kmph
D) 3.0kmph
E) 3.3kmph
M = 3.5   S = 1.5   DS = 5   US = 2   AS = (2 * 5 * 2) /7 = 2.85   Answer:2.85kmph
<result>C</result>
A man whose speed is 3.5 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?