Task: Question Answering
Input (English): Question: A boat goes 6 km up stream and 7 km down stream in 5 hours. It goes 3 km up stream and 6 km down stream in 3 hours. The speed of the boat in still water is:

 Option A: 2 km/hr

 Option B: 5.4 km/hr

 Option C: 4.8 km/hr

 Option D: 3.33 km/hr

 Option E: None of these
Output (English): Option D