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?

A 50
B 60
C 80
D 90

Correct Answer: 60

Complete trip = 10 floors up and 10 floors down = 20 floors = 20*1/4 = 5 minutes + 2 minutes = 7 minutes. 7 hour = 420 minutes. In 420 minutes operator can make 420/7 = 60 trips.
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#গণিত #ঐকিক নিয়ম (Unitary method) #Mercantile Bank Ltd #Mercantile Bank Ltd - Officer - 24.04.2009

Related Questions

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 (return) trips will the operator make during a 7 hours period?
A 50
B 60
C 80
D 90
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