Determine the period and frequency of oscillations of the pendulum if it made 60 oscillations in 3 minutes.

Here is given in the SI system:
t = 3 min = 180 s
The oscillation period is such a period of time during which the body returns to the same point from which it began its movement.
T = t / n, where n is the number of oscillations, t is the time during which the body made these oscillations.
T = t / n = 180/60 = 3c
The oscillation period depends on the frequency according to the law:
T = 1 / ν
Let us express the frequency from this expression:
ν = 1 / T = 1/3 = 0.33 Hz.
Answer: the oscillation period is 3 s, and the frequency is 0.33 Hz.