Well, isn't that just a happy little question! If we take 5400 seconds and convert them into hours and minutes, we'll find that it's 1 hour and 30 minutes. Just imagine all the beautiful things you can create in that time!
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90 hours
There are 1.5*60*60 = 5400 seconds
There are 60 seconds in 1 minute, therefore 60x90 = 5400 seconds in 90 minutes.
60 min = 1 hr ⇒ 5400 min = 5400 ÷ 60 hr = 90 hr
There are 5400 seconds in 90 minutes which is greater than 540 seconds