Solve Applications with Linear Inequalities · Exercise 134

Use the Pythagorean Theorem to find the length of the missing side. Round to the nearest tenth, if necessary.

Leon drove from his house in Cincinnati to his sister’s house in Cleveland, a distance of 252 miles. It took him $4\frac{1}{2}$ hours. For the first half hour he had heavy traffic, and the rest of the time his speed was five miles per hour less than twice his speed in heavy traffic. What was his speed in heavy traffic?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Elementary Algebra 2e · §3.6 Solve Applications with Linear Inequalities · Exercise 134