Every floor of a 104-storey skyscraper is 4 m high. If a ballon rises 3 m every second , how long will it take to rise from the 36th floor to the 96th floor?

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Solution

Number of floors from 36th floor to 96th floor = $(96 - 36)$ = 60 floors
Height of each floor = 4 m
So total height to be covered by the balloon = $60 \times 4$ = 240 m
Rise in balloon = 3m per second
So total time taken to rise 240 m = $\frac{240}{3}$ = 80 seconds = 1 minute 20 seconds
Therefore total time taken to rise from the 36th floor to the 96th floor is 1 minute 20 seconds.

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