Mathematics

Problem

It is known that

\triangle PQR \cong \triangle QRS

and

\triangle QRS \cong \triangle RST

. If

PQ = 5\,\text{cm}

, what is the length of

RS

? a)

10\,\text{cm}

4\,\text{cm}

5\,\text{cm}

3\,\text{cm}