Best Answer

30 minutes = 30 x 60 seconds = 1800 seconds

to calculate the decrease from 1800 to 3 seconds we calculate the difference and then divide through by the start number

so the difference is 1800- 3= 1797

and the original start number was 1800

so the decreae in percentage is 1797/1800 x 100% = 99.83 % decrease

Q: 30 minutes to 3 seconds is how many percent decrease?

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