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Solve this problem by doing dimensional analysis.

Start with your given (the number you are given):

21 hours

Next, obtain some conversion ratios/factors. There are 60 minutes in 1 hour. There also 60 seconds in 1 minute.

21 hours x 60 minutes/1 hour x 60 seconds/1 minute

Multiply and divide it out to get 75600 seconds.

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Q: How many seconds are in 21 hours?
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