Final answer:
To convert 42.5 miles to kilometers, multiply 42.5 by the conversion factor of 1.61 km per mile to get 68.425 km.
Step-by-step explanation:
To convert 42.5 miles to kilometers (km) using the estimation that 5 miles is approximately equal to 8 km, you would use the given conversion factor that 1 mile is equivalent to 1.61 km. Therefore, to perform the conversion, you multiply the number of miles by 1.61 km.
The calculation is as follows:
- Write down the number of miles to convert (42.5 miles).
- Multiply this number by the conversion factor (1.61 km).
- Perform the multiplication: 42.5 miles × 1.61 km/mile = 68.425 km.
Thus, 42.5 miles is equal to 68.425 kilometers.