Task: Question Answering
Input (English): Problem: if a man walks to his office at ¾ of his usual rate , he reaches office 1 / 3 of an hour late than usual . what is his usual time to reach office ? 
Options: a ) 2 hour , b ) 5 hour , c ) 1 hour , d ) 3 hour , e ) 2 hour
Output (English): c