Task: Question Answering
Input (English): Problem: if 20 men can build a wall 66 metres long in 15 days , what length of a similar can be built by 86 men in 8 days ? 
Options: a ) 151.36 mtrs , b ) 378.4 mtrs , c ) 478.4 mtrs , d ) 488.4 mtrs , e ) 578.4 mtrs
Output (English): a