Find the difference by converting both mixed numbers to fractions with a common denominator.<br><br>
&bull; \(3\frac{4}{5} = \frac{19}{5}\) and \(1\frac{1}{3} = \frac{4}{3}\)<br>
&bull; LCM of 5 and 3 is 15.<br>
&bull; \(\frac{19}{5} = \frac{57}{15}\) and \(\frac{4}{3} = \frac{20}{15}\)<br>
&bull; \(\frac{57}{15} - \frac{20}{15} = \frac{37}{15}\)<br>
&bull; Convert to mixed number: \(\frac{37}{15} = 2\frac{7}{15}\)<br><br>
John Lim spent \(2\frac{7}{15}\) hours more supervising the CCA than conducting the remedial class.<br>
Check: \(1\frac{1}{3} + 2\frac{7}{15} = 1\frac{5}{15} + 2\frac{7}{15} = 3\frac{12}{15} = 3\frac{4}{5}\). ✓