It is a measure of speed.
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1 minute = 60 seconds ⇒ 7 minutes 20 seconds = 7 x 60 seconds + 20 seconds = 440 seconds
There are 168 hours & 604,800 seconds in 7 days.
There are 60 seconds in one minute. Therefore, 7 minutes 40 seconds is equal to 7 x 60 + 40 = 460 seconds.
There are 420 seconds.
7 years = 220 898 482 seconds