#### Answer

$\frac{176}{55}$ hours
distance=rate*time

#### Work Step by Step

Subtracting tells us the distance between the two cities. $357-181=176$.
We can solve this problem using the formula distance=rate*time. The distance is 176 miles and the rate is 55 mph. Substituting these numbers into the formula gives $176=55t$. Divide both sides by 55 to get the answer in hours, $t=\frac{176}{55}$.