9 hours
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540 divided by 60(9 hours)Nine hours equals 540 minutes.
9
There are 32,400 seconds and 540 minutes in nine hours.
7am to 5:40pm is 10 hours and 40 minutes.
1 hour = 3,600 seconds12 hours = 43,200 seconds1 minute = 60 seconds9 minutes = 540 seconds12 hours + 9 minutes = 43,740 seconds