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A minute is 60 seconds, so 45 minutes is 45 x 60 = 2700 seconds

An hour is 60 minutes, three hours is 180 minutes but each minute is 60 seconds, so

180 minutes is 180 x 60 = 10800 seconds.

Adding the two we get 10800 + 2700 = 13500 seconds

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10y ago
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Q: How many seconds are in 3 hr and 45 min explain?
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