We simply use the formula,
[tex]velocity =\frac{distance}{time}[/tex]
Given, velocity = 4 m per s and distance = 120 m.
Substituting these values, we get
[tex]4\ m/s =\frac{120\ m}{time}\\\\\ time=\frac{120\ m}{4\ m/s} = 30\ s[/tex].
Thus, required time for the elevator in order to travel 120 m upwards is 30 s.
