Task: Question Answering
Input (English): Problem: calculate how long it will take a swimmer to swim a distance of 12 km against the current of a river which flows at 1.2 km / hr, given that he can swim in still water at 5 km / h
Options: a. 3.26, b. 3.16, c. 2.34, d. 3.98, e. 3.17
Output (English): b