The Hobbits are building a watchtower so they can prepare to battle in case trolls decide to attack them. One Hobbit will always be on the lookout and the Hobbits will prepare for battle as soon as the trolls are visible. The time, $T$, in minutes, that the Hobbits have to prepare for the attack of trolls $k$ meters away is given by the function $T(k)=\dfrac{k}{80}$. The visibility, $V$, in meters, that the Hobbits have from an $m$ meter watch tower is given by the function $V(m)=50m$. **Find an explicit expression that models the amount of time the Hobbits have to prepare for a troll attack given that the watchtower is $m$ meters tall.** [[☃ expression 1]]