Commuting from Work to Home, a Lab Technician Traveled 10

Multiple Choice

Commuting from work to home, a lab technician traveled 10 mi at a constant rate through congested traffic. On reaching the expressway, the technician's speed increased by 22 mph. An additional 20 mi was traveled at the increased speed. The total time for the trip was 1 h. Find the rate of travel through the congested traffic.

A) 19.4 mph
B) 27.4 mph
C) 20.4 mph
D) 18.4 mph
E) 28.4 mph