Task: Question Answering
Input (English): Problem: a man can row downstream at 25 kmph and upstream at 15 kmph. find the time to reach a destination point at a distance of 50 km along the downstream.
Options: a. 4 hrs., b. 1 hrs., c. 3 hrs., d. 2 hrs., e. 2 1 / 2 hrs.
Output (English): d