A man can row 7 kmph in still water. When the river is running at 1.2 kmph, it takes him 1 hour to row to a place and back. What is the total distance traveled by the man? Choose the correct choice from the following answers
A) 6.24 km
B) 6 km
C) 6.79 km
D) 5.66 km
E) 10 km

Rationale: "m = 7 s = 1.2 ds = 8.2 us = 5.8 x / 8.2 + x / 5.8 = 1 x = 3.40 d = 3.40 * 2 = 6.79 answer : c"
Answer: C