Task: Question Answering
Input (English): Problem: the elevator in an 11 - story office building travels at the rate of one floor per 1 / 4 minute , which allows time for picking up and discharging passengers . at the main floor and at the top floor , the operator stops for 1 minute . how many complete trips will an operator make during a 4 - hour period ? 
Options: a ) 88 , b ) 56 , c ) 42 , d ) 34 , e ) 64
Output (English): d