Task: Question Answering
Input (English): Question: Kelsey travelled for 10 hours. He covered the first half of the distance at 25 kmph and remaining half of the distance at 40 kmph. Find the distance travelled by Kelsey?

 Option A: 583 km

 Option B: 400 km

 Option C: 670 km

 Option D: 360 km

 Option E: 234 km
Output (English): Option B