Solve by building an equation model and using the problem-solving guidelines as needed. Ch...

Solve by building an equation model and using the problem-solving guidelines as needed. Check all answers using a graphing calculator. Uniform Motion Exercises

Jeff had a job interview in a nearby city 72 mi away. On the first leg of the trip he drove an average of 30 mph through a long construction zone, but was able to drive 60 mph after passing through this zone. If driving time for the trip was hr, how long was he driving in the construction zone?