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I live X floors above the ground floor of a high-rise building. It takes me 30sec per floor to walk down the steps and 2sec per floor to ride the...
Solution
Since I live X floors above the ground floor and it takes me 30sec per floor to walk and 2sec per floor to ride,...
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Keynote
X  > 14 as time taken to walk has to be greater than 7 min.
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