Answer:
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 [tex]4\frac{1}{2}=4.5[/tex] hours.
Use formula:
[tex]D=r\cdot t,[/tex]
where
D = distance
r = rate
t = time.
In your case,
D = 239.4 miles
t = 4.5 hours
Hence,
[tex]239.4=4.5r\\ \\r=\dfrac{239.4}{4.5}=53.2\ mph[/tex]
