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 4-hour period?	Choose the correct choice from the following choices:
A) 88
B) 56
C) 42
D) 34
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.   4 hour = 240 minutes.   In 240 minutes operator can make 240/7=34 trips.   Answer: 34.
<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 4-hour period?