Radford and Peter ran a race, during which they both ran at a constant speed. Radford began the race 30 \mathrm{~m} ahead of Peter. After 3 minutes, Peter was 18 \mathrm{~m} ahead of Radford. Peter won the race exactly 7 minutes after it began. How far from the finish line was Radford when Peter won?
Answer Choices
A. 16 \mathrm{~m}
B. 64 \mathrm{~m}
C. 48 \mathrm{~m}
D. 82 \mathrm{~m}
E. 84 \mathrm{~m}