Since 1 hour means 60 minutes then what does 1.643 hours mean?

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Solution

$1.643 hours = 1 hour + 0.643 hour = 1 hour + 0.643 \times 60 minutes = 1 hour + 38.58 minutes = 1 hour + 38 minutes + 0.58 minute = 1 hour + 38 minutes + 0.58 \times 60 seconds = 1 hour + 38 minutes + 34.8 seconds = 1 hour 38 minutes 34.8 seconds$

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