Differentiation - Connected Rates of Change

The equation of a curve is given by \(y = (x - 3)\sqrt{2x + 1}\). A particle moves along the curve such that the \(x\)-coordinate of the particle increases at a constant rate of \(0.15\) unit/s, find

1. the rate of change of the \(y\)-coordinate of the particle when \(x = 3\), and
2. the possible \(x\)-coordinate(s) of the particle at the instant(s) when the rate of decrease of the \(y\)-coordinate is twice of the rate of increase of the \(x\)-coordinate.