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It is 1/2 of a second
your heart beats one time a second
A second is a measure of time, or a unit of time.
A nanometre is a measure of distance, metres per second is a measure of speed. The two measure different things and one cannot be converted to the other.
centimetres measure space and seconds measure time, therefore your question does not make sense. centimetres per second is a measure of velocity (speed)