Task: Question Answering
Input (English): Problem: in a stream running at 3 kmph , a motor boat goes 10 km upstream and back again to the starting point in 57 minutes . find the speed of motor boat in still water ? 
Options: a ) 18 kmph , b ) 22 kmph , c ) 16 kmph , d ) 20 kmph , e ) none of these
Output (English): b