Particle R has acceleration aR(t)=6t−4 with initial velocity vR(0)=1 m/s and initial position xR(0)=0. Particle S has acceleration aS(t)=−2 with initial velocity vS(0)=−3 m/s and initial position xS(0)=20 m. Determine all times t>0 when the two particles have equal velocity.