The rate of the following reaction doubles when molar concentration of A alone gets doubled but increases fourfold when molar concentration of both A and B are doubled.
$\mathrm{A}+\mathrm{B}\to \mathrm{C}$
1000 seconds taken for concentration of [A] decrease from initial value of 10^-4 M to $5\times {10}^{-5}$ M for initial concentration of [B] as 1M.
Given ln 2 = 0.70