$\cfrac{9}{12}\implies \cfrac{1+1+1+1+1+1+1+1+1}{12} \\\\\\ \cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}+\cfrac{1}{12}$

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Stan drove for h hours at a constant rate of r miles per hour. How many miles did he cover during the final 20 minutes of his dr

photoshop1234 [79]

20 minutes is $\frac{1}{3}$ of an hour (60 minutes).

Stan's constant rate is r miles per hour, which means he drove r miles in 60 minutes. So how many miles did he drive in 20 minutes? As explained in the first line, 20 minutes is $\frac{1}{3}$ of an hour. Since his rate is constant, Stan would drive $\frac{1}{3}$ of what he cover in 60 minutes, which is r miles.

Hence, Stan drove $\frac{1}{3}r$ miles in 20 minutes.