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**[SOLVED] phase difference problem - need help**

## Homework Statement

Two particles execute simple harmonic motion of the same amplitude and frequency along close parallel lines. The pass each other moving in opposite directions each time their displacement is half their amplitude. What is the phase difference.

## Homework Equations

X = A cos(ωt + θ)

T = 2π/ω

T = 1/f

## The Attempt at a Solution

A is the same for both

f is the same, so t is the same

T is the same, so ω is the same

but since no numbers are given I am lost