In 1908, the marathon was lengthened by 42 − 40 = 2 kilometers. Since 1 mile is approximately 1.6 kilometers, the increase of 2 kilometers can be converted to miles by multiplying as shown:2kilometers×
1 mile
1.6 kilometers
=1.25 miles Choices A, C, and D are incorrect and may result from errors made when applying the conversion rate or other computational errors.