10 km is equal to __________ miles?

To convert kilometers to miles, you can use the conversion factor where 1 kilometer is approximately equal to 0.6215 miles. Therefore, to find out how many miles are in 10 kilometers, you multiply the number of kilometers by the conversion factor:

10 km × 0.6215 miles/km = 6.215 miles.

This calculation shows that 10 kilometers converts to approximately 6.215 miles, which corresponds to the correct answer. Understanding this conversion is crucial in various fields, especially in engineering contexts where distance measurements may need to be converted between metric and imperial systems.