Task: Question Answering
Input (English): Problem: calculate the speed of a boat in still water ( in km / hr ) if in one hour , the boat goes 13 km / hr downstream and 10 km / hr upstream . 
Options: a ) 3 kmph , b ) 9 kmph , c ) 4 kmph , d ) 8 kmph , e ) 6 kmph
Output (English): b