A hiker plans a trip in two sections. Her destination is 18 km away on a bearing of N63'E from her starting position. The first leg of the trip is on a bearing of N13E. The second leg of the trip is 16 km. How long is the first leg? Give the answer to the nearest tenth of a kilometre. The first leg is approximately km. (Do not round until the final answer. Then give your answers to the nearest tenth. Use a comma to separate answers as needed.)