Task: Question Answering
Input (English): Problem: it takes 10 days for digging a trench of 100 m long , 50 m broad and 10 m deep . what length of trench , 25 m broad and 15 m deep can be dug in 30 days ? 
Options: a ) 400 m , b ) 200 m , c ) 100 m , d ) 89 m , e ) 79 m
Output (English): a