The interface shifts 2a/3 from the initial position or it shifts to a position whose distance from A is 2a/3 ?
Sahil Jain shifts to 2a/3
I think position of interface is required for solving this question.
The interface shifts 2a/3 from the initial position or it shifts to a position whose distance from A is 2a/3 ?
I think the interface lenght is required,then may be the solution will be like this