Kinematics of motion in a straight line — practice question

Alan begins moving from point $O$ at a steady speed of $4\,\text{m s}^{-1}$, travelling along a horizontal path. Ben travels on the same path and also sets off from $O$. Ben remains at rest for $5\,\text{s}$ after Alan begins, then accelerates at $1.2\,\text{m s}^{-2}$ for $5\,\text{s}$. After that, Ben keeps moving at a constant speed until he reaches the same point, $P$, as Alan.