If a runner maintains a constant speed of 12 miles/hour, how long will it take to complete a half marathon on 13.1 miles?

157.2 milles in 13.1 hours

explanation:

if a runner runs 12mph

then that means every hour is 12 miles,

so if there is 13 miles(doing distributive property),

12mph x 13 miles = 156m

but you still have a .1 miles left for every 12 hours

12mph x 0.1 miles= 1.2 miles

finally you would have to add both final miles together.

156m + 1.2m= 157.2 miles in 13.1 hours

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