Task: Question Answering
Input (English): Problem: working alone at their respective constant rates , a can complete a task in ‘ a ’ days and b in ‘ b ’ days . they take turns in doing the task with each working 2 days at a time . if a starts they finish the task in exactly 14 days . if b starts , they take a day more . how long does it take to complete the task if they both work together ? 
Options: a ) 12 , b ) 14 , c ) 10 , d ) 11 , e ) 13
Output (English): b