The following results have been obtained during the kinetic studies of the reaction $2P+Q\to R+S$       

Experiment	[P] mol/lit	[Q] mol/lit	Rate of reaction (mol/lit/sec)
I	0.1	0.1	$\text{6}\times {\text{10}}^{\text{-3}}$
II	0.4	0.1	$\text{2}\text{.4}\times {\text{10}}^{\text{-2}}$
III	0.4	0.2	$\text{9}\text{.6}\times {\text{10}}^{\text{-2}}$
IV	0.8	0.4	$\text{76}\text{.8}\times {\text{10}}^{\text{-2}}$

The correct option for the rate equation for above reaction is