Discussion

Explanation:

Since I live X floors above the ground floor and it takes me 30 s per floor to walk down and 2 s per floor to ride the lift, it takes 30X s to walk down and 2X s to ride the lift after waiting 420 s.
⇒ 30X = 2X + 420 ⇒ X = 15.

Alternative method:
X > 14 as time taken to walk has to be greater than 7 min.

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