Task: Question Answering
Input (English): Problem: machine a takes 100 hours to complete a certain job and starts that job at 7 am . after two hour of working alone , machine a is joined by machine b and together they complete the job at 6 pm . how long would it have taken machine b to complete the jobif it had worked alone for the entire job ? 
Options: a ) 10.11 , b ) 9.99 , c ) 11.1 , d ) 44.11 , e ) 1.01
Output (English): a