3 inches is just over 7½ cm
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7 cm = 2.756 inches (approx).
7cm divided by the conversion factor of 2.54 cm/inch results in 2.756 inches.
40 cm = 15.748 inches so it is longer than 13 inches.
7cm because if the mm was 5 or over then it would be closer to 8cm but it is lower than 5 so it is closer to 7cm.
yes