The volume of containers A and B, connected by a tube and a closed valve are V and 4V respectively. Both the containers A and B have the same ideal gas, at pressures 5.0 × 10⁵ Pa and 1.0 × 10⁵ Pa and temperatures 300 K and 400 K respectively. The valve is opened to allow the pressure to equalise, but the temperature of each container is kept constant at its initial value. Find the common pressure in the containers.
A. 2.5 × 10⁵ Pa
B. 2.0 × 10⁵ Pa
C. 3.0 x 10⁵ Pa
D. 1.5 x 10⁵ Pa