In the given figure angle $Q$ is a right angle, $P S: Q S=3: 1, R T \cdot Q T=5: 2$ and $P U: U R=1: 1$. If area of triangle QTS is $20 \mathrm{~cm}^{2}$, then the area of triangle $\mathrm{PQR}$ in $\mathrm{cm}^{2}$ is__________
In the given figure angle $Q$ is a right angle, $P S: Q S=3: 1, R T \cdot Q T=5: 2$ and $P U: U R=1: 1$. If area of triangle QTS is $20 \mathrm{~cm}^{2}$, then the area of triangle $\mathrm{PQR}$ in $\mathrm{cm}^{2}$ is__________