The correct answer is:
$1.5748\text{ in}$
Explanation
1 inch equals $25.4\text{ mm}$, so convert millimeters to inches by dividing by $25.4$. Dividing $40\text{ mm}$ by $25.4\text{ mm/in}$ gives the result in inches.
Steps:
- Conversion factor: $1\text{ in}=25.4\text{ mm}$
- Compute: $$\text{inches}=\frac{40\text{ mm}}{25.4\text{ mm/in}}=\frac{40}{25.4}=1.57480315\text{ in}$$
- Rounded (4 decimal places): $1.5748\text{ in}$
Therefore, $40\text{ mm}\approx1.5748\text{ in}$ (about $1.575\text{ in}$ to three decimal places).