421.1 rpm is how much revolution/second

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420.6 rpm is how much revolution/second 420.7 rpm is how much revolution/second 420.8 rpm is how much revolution/second 420.9 rpm is how much revolution/second 421 rpm is how much revolution/second 421.1 rpm is how much revolution/second 421.2 rpm is how much revolution/second 421.3 rpm is how much revolution/second 421.4 rpm is how much revolution/second 421.5 rpm is how much revolution/second

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