Possibly because someone cannot add properly.
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20s, 30s, 40s, 50s, 60s, 70s, 80s.Seven decades.
1min = 60s 6.6min x 60s/min = 396s
1min = 60s 650s x 1min/60s = 10.8333min = 10min and 50s
60s * 60m= 3,600s. 3,600 seconds in a hour.
equilateral (doesn't matter whether the 60s are the angles or the sides)