$A\stackrel{HighP\text{\hspace{0.17em}}\&T}{\to }3B+C$  is a first order reaction. If A is strong mono protic acid and B is strong diprotic acid then the reaction kinetics can be studied by using a standard solution of NaOH required to neutralize reaction mixture at different instants of time. Initially we had taken the same concentration of A in each case. Now it was observed that volume required after 971 sec was double that required initially, then the half life of  reaction (in seconds) is  $x\times {10}^{-3}$ what is $x$  value (rounding to nearest integer)____________
Given log(5/4) = 0.0971 and ln 2 = 2.303 log 2