Task: Question Answering
Input (English): Question: A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?

 Option A: 7 kmph

 Option B: 4 kmph

 Option C: 4 kmph

 Option D: 8 kmph

 Option E: 5 kmph
Output (English): Option D