Kinematics of motion in a straight line — practice question

At time $t = 0$, with $t$ measured in seconds, a runner leaves point $P$. The runner is initially at rest, then accelerates at $1.2\,\text{m s}^{-2}$ for $5\,\text{s}$. During the following $12\,\text{s}$ the runner continues at a constant speed, and then decelerates uniformly over $3\,\text{s}$ until coming to rest at $Q$. A cyclist leaves $P$ at time $t = 10$ and accelerates uniformly for $10\,\text{s}$, after which the cyclist immediately decelerates uniformly to rest at $Q$ at time $t = 30$.