2 3/8 : 3 3/12 =

Convert mixed numbers to improper fractions: 2 3/8 = 19/8, 3 3/12 = 39/12. Divide the fractions: (19/8) / (39/12) = (19/8) * (12/39) = (19 * 12) / (8 * 39) = 228 / 312. Simplify the fraction: 228/312 = 19/26. The answer is 19/26.