There are an infinite number of possibilities.
Here are a few:
1 x 60
1.5 x 40
1.8 x 33-1/2
2 x 30
2.2 x 27-3/11
2.4 x 25
2.5 x 24
2.7 x 22-2/9
3 x 20
3.2 x 18.75
3.5 x 17-1/7
3.6 x 16-2/3
4 x 15
4.4 x 13-7/11
4.5 x 13-1/3
4.8 x 12.5
5 x 12
5.4 x 11-1/9
5.5 x 10-10/11
6 x 10
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