Velocity of an object fired directly in upward direction is given by $V = 80 – 32\: t$, where $t$ (time) is in seconds. When will the velocity be between $32\: m/sec$ and $64\: m/sec$?

1. $(1, 3/2)$
2. $(1/2, 1)$
3. $(1/2, 3/2)$
4. $(1, 3)$