1090mm = 109cm Ben is taller.
1 cm = 10 mm
Ben = 140 cm Mike = 1090/10 = 109 cm
140 - 109 = 31 31 * 10 = 310
Ben is taller by 31 cm or 310 mm
Ben is taller than Mike by 31 cm, which is equivalent to 310 mm.
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