Set Up an Equation and Solve the Following Problem

Multiple Choice

Set up an equation and solve the following problem. Erin starts walking from point A at 1 mile per hour. One-half hour later, Chris starts walking from point A at 6 miles per hour and follows the same route. How long (in hours) will it take Chris to catch up with Erin?

A) 0.3 hour
B) 0.1 hour
C) 0.5 hour
D) 0.05 hour
E) 0.4 hour