Kinematics of motion in a straight line — practice question

An athlete moves along a straight horizontal road. The athlete begins from rest and accelerates at $0.5\text{ m s}^{-2}$ until reaching a speed of $V\text{ m s}^{-1}$. The athlete then keeps this speed of $V\text{ m s}^{-1}$ for $T\text{ s}$ before slowing at $0.2\text{ m s}^{-2}$ until coming to rest. In total, the athlete travels $1350\text{ m}$ in $246\text{ s}$.