Answer:
![\boxed {\boxed {\sf A.\ 30 \ mph \ north}}](https://img.qammunity.org/2021/formulas/mathematics/middle-school/5hmcv92lt9rzvfnowwyfy5qqbjj4iaiaus.png)
Explanation:
Velocity can be found by dividing the displacement by the time.
![v=(s)/(t)](https://img.qammunity.org/2021/formulas/physics/college/udav3u5mwq3btubigkpsjczsqmxrgmv1s4.png)
The displacement of the truck is 75 miles north. The time is 2.5 hours.
![s= 75 \ miles \ north \\t= 2.5 \ hr](https://img.qammunity.org/2021/formulas/mathematics/middle-school/sk1tqs7nfoqw0xv6nn5jtml179m02x7ymc.png)
Substitute the values into the formula.
![v=(75 \ miles \ north )/( 2.5 \ hr)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jkyt5eadfqnmvqyk6r5efg8cygbg9gw4ej.png)
Divide.
![v= 30 \ miles \ north / hr](https://img.qammunity.org/2021/formulas/mathematics/middle-school/nsfj5gtptyaqc7sztdasunkucczukuvokp.png)
![v= 30 \ miles/hour \ north](https://img.qammunity.org/2021/formulas/mathematics/middle-school/rx0y262teqwfho78cbbtfxrzxwewzgzfcr.png)
The velocity of the truck is 30 miles per hour north.