The elevator in an eleven-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 3-hour period?	Answers
A) 88 B) 56 C) 42 D) 25 E) 64
Complete trip = 10 floors up and 10 floors down = 20 floors = 20*1/4= 
<gadget id="calculator">20*1/4</gadget>
<output>5</output>
5 minutes plus 2 minutes= 7 minutes.   3 hour = 180 minutes.   In 180 minutes operator can make 180/7=25 trips.   Answer: 25.
<result>D</result>
The elevator in an eleven-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 3-hour period?