For this case, what we should do is find Ammar's speed.
We have then:
[tex] v =\frac{d}{t}
[/tex]
Where,
d: distance
t: time
Then, on the other hand we have:
1 hour = 60 minutes
Substituting values we have:
[tex] v = \frac{2\frac{3}{4}}{1\frac{15}{60}} [/tex]
Rewriting we have:
[tex] v= \frac{\frac{11}{4}}{\frac{75}{60}} [/tex]
[tex] v= \frac{\frac{11}{4}}{\frac{5}{4}} [/tex]
[tex] v = \frac{11}{5} [/tex]
Answer:
Ammar hikes [tex] \frac{11}{5} [/tex] miles per hour