Question

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.

Answer 1

Answer:53.2 mph

Explanation:

Answer 2

53.2 mph

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
`4(1)/(2)=4.5` hours.

Use formula:

`D=r\cdot t,`

where

D = distance

r = rate

t = time.

In your case,

D = 239.4 miles

t = 4.5 hours

Hence,

`239.4=4.5r\\ \\r=(239.4)/(4.5)=53.2\ mph`