Respuesta :

clarch19

Answer:

2 1/4 hamburgers per hour

Step-by-step explanation:

1/3 of an hour equals 20 minutes

r = rate per hour

(20 min ÷ 3/4) = (60 min ÷ r)

cross-multiply to get:

3/4 · 60 = 20r

45 = 20r

r = 45/20 or 9/4 which is 2 1/4