Task: Question Answering
Input (English): Problem: it takes avery 3 hours to build a brick wall while tom can do it in 5 hours . if the two start working together and after an hour avery leaves , how much time will it take tom to complete the wall on his own ? 
Options: a ) 100 , b ) 110 , c ) 120 , d ) 130 , e ) 140
Output (English): e