Number of floors from 36th floor to 96th floor = = 60 floors
Height of each floor = 4 m
So total height to be covered by the balloon = = 240 m
Rise in balloon = 3m per second
So total time taken to rise 240 m = = 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.