Solve the Problem $34 \mathrm {~cm}$ the Length Is $7 \mathrm {~cm}$

Solve the problem.
-The perimeter of a rectangle is $34 \mathrm {~cm}$ . The length is $7 \mathrm {~cm}$ longer than the width. What are the length and width of the rectangle?

A) Length: $13 \mathrm {~cm}$ ; width: $6 \mathrm {~cm}$
B) Length: $12 \mathrm {~cm}$ ; width: $5 \mathrm {~cm}$
C) Length: $7 \mathrm {~cm}$ ; width: $5 \mathrm {~cm}$
D) Length: $17 \mathrm {~cm}$ ; width: $10 \mathrm {~cm}$