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Question
The elevator in an eleven-storied office building travels at the rate of one floor per 1/4 minute, which allows time for picking up and letting down passengers. At the main floor and at the top floor the operator stops for 1 minute. How many complete (with return) trips will the operator makes during a 7-hour period?
50
60
80
90
None of these
ANSWER : 2
Descrption
<p>Complete trip = 10 floors up and 10 floors down = 20 floors = 20*1/4 = 5 minutes + 2 minutes = 7 minutes.</p> <p>7 hour = 420 minutes.</p> <p>In 420 minutes operator can make 420/7 = 60 trips.</p>
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