A rower can row 6 km/h in still water. When the river is running at 2 km/h, it takes the rower 1 hour to row to Big Rock and back. How many kilometers is it to Big Rock?  Options: A) 2.21 B) 2.45 C) 2.67 D) 2.83 E) 2.95

Rationale: "let x be the distance to big rock . time = x / 4 + x / 8 = 1 x = 32 / 12 = 2.67 km the answer is c ."
Answer: C