None. "Year" is a period of time, but "light year" is a distance ...
the distance light travels in a year.
If a distance could be converted to a time, then you'd be able to
figure out how many minutes wide your bedroom is.
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49 does not go into 189 evenly. 189 divided by 49 equals 3 with a remainder of 42.
21 x 2
1 x 42, 2 x 21, 3 x 14, 6 x 7, 7 x 6, 14 x 3, 21 x 2, 42 x 1 = 42
It was created about 1770 BC in Babylonia.
42 = 1 x 42, 2 x 21, 3 x 14, 6 x 7, 7 x 6, 14 x 3, 21 x 2, 42 x 1