11. The Pentagon $P Q R S T$ is divided into four triangles with equal perimeters. The triangle $P Q R$ is equilateral. $P T U$, SUT and $R S U$ are congruent isosceles triangles. What is the ratio of the perimeter of the pentagon $P Q R S T$ to the perimeter of the triangle $P Q R$ ?
A $2: 1$
B $3: 2$
C $4: 3$
D $5: 3$
E $5: 2$