Question

Find.$1\frac{2}{5}of4\frac{2}{7}km$

Answer 1

Find.$1\frac{2}{5}of4\frac{2}{7}km$

$$\begin{gathered} 1\frac{2}{5}of4\frac{2}{7}km=1\frac{2}{5}\times 4\frac{2}{7} \\ =\frac{5\times 1+2}{5}\times \frac{7\times 4+2}{7} \\ =\frac{7}{5}\times \frac{30}{7} \\ =6 \\ \therefore 1\frac{2}{5}of4\frac{2}{7}km=6km \end{gathered}$$