5400 seconds in 90 minutes. In case you didn't know, you just multiply 90x60 because there are 60 seconds in every minute.
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There are 60 minutes in an hour. Therefore: 90 = 1.5 or 1 hours 30 minutes
Answer: 2.8 seconds has 2.8 seconds.
900,000 seconds = 900,000 seconds.
86 seconds
eighty seconds