The correct answer is:
[D]: "
52.2 miles" .
____________________________________________________________Step-by-step explanation:____________________________________________________________Take note of the formula:
d = r * t ;
The question asks: "How many miles will he travel in "
3.5 hours" ?
So, we want to find "
d" , the distance (in units of "
mi." {
miles} ) .
We are give: rate, "
r" = 15 mi / hr .
time, "
t" = 3.5 hr.
__________________________________________________________ → d = r * t ;
Plug in our known values for "
r" and "
t" ; to solve for "
d" ;
→ d = 
;
Both units of "hr" cancel out to "1" ; since: " hr/hr = 1 " .
And we are left with:
→ d = (15 * 3.5) mi. ;
→
d = 52.5 mi. ________________________________________________________The answer is: "
52.5 mi. " ;
→ which is: "
Answer choice: [D]: "
52.5 miles " .
________________________________________________________