#### Explanation:

6:40am to 7:40 = 1 hour

He walked the dog from 6:40am to 7:30am

$\therefore 7 : 40 a m - 7 : 30 = 10$ minutes short from 1 hour

So he walked the dog for 50 minutes in one day.

His rate per hour = $6 1 hour = 60 minutes :.=$6 per hour ( per 60 minutes)

:.cancel50^5/cancel60^6 xx $6 :.5/cancel6^1 xx$cancel6/1

#### Explanation:

Since Jerry walked the dog from 6:40am to 7:30am, the total minutes that he walked the dog was $50$ minutes. Also a note, an hour is $60$ minutes.

Since he is paid at a rate of  $6  per $60$minutes, we can make a proportion. $\frac{6}{60} = \frac{x}{50}$From here, you have to solve for $x$. So cross multiply, and then simplify. $60 x = 50 \cdot 6$$\frac{60 x}{60} = \frac{50 \cdot 6}{60}$$\frac{\cancel{60} x}{\cancel{60}} = \frac{5 \cancel{0} \cdot 6}{6 \cancel{0}}$$x = \frac{5 \cdot \cancel{6}}{\cancel{6}}$$x = 5$So the answer is $5 .

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