if a dog walks 3/5 of a mile in 3/20 hours, what is the rate in miles per hour

Question

solve the rate

Answer 1

3/5 : 3/20 :: m: 1  proportion

3/5 = (3/20)m       product means/extremes

12 = 3m                multiply both sides gy 20

4 = m                   divide both sides by 3

 

4 mph 

Answer 2

(3/5)/(3/20) = r/1

 

Cross multiply.

 

(3/20)r = 3/5

r = (3/5)(20/3) = 4 mph