A multistory building has 21 floors each of height 5 m. It also has 3 floors in the basement each of height 3 m. A person enters the lift at 17 floor and his car is parked at 2nd floor of the basement. If the lift travels at the speed of 7m/sec, how much time will the person take to reach 2 nd floor of basement.
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13 second
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