Mara's family is driving to her grandmothers' house. The family travels 239.4 miles between the hours of 9:10 a. m. to 1:40 p. m. Write an equation that Mara can use to determine their average rate of travel, R, rounded to the nearest mile per hour.

Use the given numbers and operations to complete an equation.

Answer:53.2 mph

53.2 mph

Step-by-step explanation:

Mara's family travels 239.4 miles between the hours of 9:10 a. m. to 1:40 p. m.

1:40 p. m. is 13:40.

Thus, they traveled for

13 hours 40 minutes - 9 hours 10 minutes = 4 hours 30 minutes

that is hours.

Use formula:

where

D = distance

r = rate

t = time.

In your case,

D = 239.4 miles

t = 4.5 hours