Task: Question Answering
Input (English): Question: A, B, K start from the same place and travel in the same direction at speeds of 30 km/hr, 40 km/hr, 160 km/hr respectively. B starts two hours after A. If B and K overtake A at the same instant, how many hours after A did K start?

 Option A: 5.0

 Option B: 5.5

 Option C: 6.0

 Option D: 6.5

 Option E: 7
Output (English): Option D