A woman complete a journey in 30 hours. She travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km. Choose the correct choice from the following choices:	A) 334 km .	B) 216 km .	C) 314 km .	D) 224 km .	E) 672 km .

Rationale: "0.5 x / 21 + 0.5 x / 24 = 30 - - > x / 21 + x / 24 = 60 - - > x = 672 km . e"
Answer: E