15.35 in.
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390 mm = 15.4 inches, approx.
25,4 mm = 1 in (exactly) → 390 mm = 390 ÷ 25.4 in = 15 45/127 in ≈ 15.35 in
10 mm = 1 cm 390 mm = 39 cm
Five inches is as long as it is long - so it is 5 inches long.
Four inches is four inches long.