A man whose speed is 7 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 the correct option.
A) 6.7 B) 4 C) 6 D) 9 E) 3
M = 7.0   S = 1.5   DS = 8.5   US = 5.5   6.7S = (2 * 8.5 * 5.5) /14 = 6.7   6.7nswer:6.7
<result>A</result>
A man whose speed is 7 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?