Tuesday, September 21, 2010

Jan lives X floors above the ground floor of a highrise building. It takes her 30 seconds per floor to walk down the steps and 2 seconds per floor to ride the elevator. If it takes Jan the same amount of time to walk down the steps to the ground floor as to wait for the elevator for 7 minutes and ride down, then X equals:

A - 4
B - 7
C - 14
D - 15
E - 16







30x = 2x + 7*60
x = 15

Ans - D

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