Carbon disulfide cs2 has a vapor pressure of 300 torr at

Question

Problem: Carbon disulfide (CS2) has a vapor pressure of 300 Torr at room temperature (almost half of atmospheric pressure). A sample of CS2 at a temperature of T = 20.0°C is contained in a vacuum chamber at a pressure of P = 2.00 × 10² Torr in a research lab. If the diameter of the CS2 molecules is d = 2.00 × 10^-10 m,

Part A: Estimate the average time between collisions that the gas is experiencing inside the test chamber.

I need help to find the average time between collisions that the gas is experiencing inside the test chamber.