Task: Question Answering
Input (English): Problem: john can complete a given task in 20 days . jane will take only 10 days to complete the same task . john and jane set out to complete the task by beginning to work together . however , jane was indisposed 5 days before the work got over . in how many days did the work get over from the time john and jane started to work on it together ? 
Options: a ) 8 , b ) 10 , c ) 12 , d ) 16 , e ) 20
Output (English): b