Convert countdown to minutes and seconds

Question

I am looking for a way to convert a 4-digit countdown into minutes. meaning instead of going like this "302, 301, 300, 299..."
I want it to go "302, 301, 300, 260, 259...."

Answer 1

Was this what you were looking for
https://code.sololearn.com/WaJp4AK2OGxe/#js