AP and TS EAMCET Engineering Model Paper 17

Substance A decomposes in solution following the first order kinetics .Flask I contains 1 L of 1 M solution A and flask II contains 100 ml of 0.6 M solution of A. After 8 hrs the concentration of A in flask I become 0.25 M. What will be the time for concentration of A in flask II to become 0.3 M?