Task: Question Answering
Input (English): Problem: a worker can load one truck in 6 hours . a second worker can load the same truck in 5 hours . if both workers load one truck simultaneously while maintaining their constant rates , approximately how long , in hours , will it take them to fill one truck ? 
Options: a ) 2.7 , b ) 2.9 , c ) 3.1 , d ) 3.3 , e ) 3.5
Output (English): a