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irspow
That would depend on which of 3 and 5 that you consider the length.  If we see this as a standard business card the length would be 3 in as it is 5 in wide as you look at it.

w/15=5/3  multiply both sides by 15

w=75/3 in

w=25 in

...

if you need it the other way around...

w/15=3/5  multiply both sides by 15

w=45/5 in

w=9 in

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