Task: Question Answering
Input (English): Question: A walks at 30 kmph and 30 hours after his start, B cycles after him at 40 kmph. How far from the start does B catch up with A?

 Option A: 1200km

 Option B: 1500km

 Option C: 2000km

 Option D: 2500km

 Option E: 3600km
Output (English): Option D