Let \( x = x(t) \) and \( y = y(t) \) be solutions of the differential equations \( \frac{dx}{dt} + a x = 0 \) and \( \frac{dy}{dt} + b y = 0 \) respectively, \( a, b \in \mathbb{R} \). Given that \( x(0) = 2 \); \( y(0) = 1 \) and \( 3y(1) = 2x(1) \). The value of \( t \), for which \( x(t) = y(t) \), is:
