Jim and Cara begin running at the same time and they start at the same place on a straight path. Jim runs at 6 miles per hour, and Cara runs at 5 miles per hour. After 30 minutes, Jim stops to stretch. If it takes Jim 18 minutes to stretch and Cara continues to run during this time, how many minutes will it take Jim to catch up to Cara? Answers
A) 40 B) 50 C) 60 D) 70 E) 80

Rationale: in 30 minutes , jim runs 3 miles . in 48 minutes , cara runs 4 miles . jim can catch cara at a rate of 1 mile per hour . since cara is ahead by 1 mile , it will take jim 1 hour = 60 minutes to catch cara . the answer is c .
Answer: C