calulate with input

Hi,

I want to write a time in a cell e.g. 12 minutes.

then i want it to automatically divide 12 with 1440, without doing any extra typing.

how do i do this ?

thanks in advance!

ye, that i know

but i want it to be in one cell.. eg i enter 12 in A1 and press enter then i calc 12/1440.