Phase of a point

1. The problem statement, all variables and given/known data
A wave travels along a straight line with speed 1m/s . The initial phase angle is 0. Wavelength = 4m. Measured from initiation of waves, when will the phase of the point 5m from the wave source first be 180°?

3. The attempt at a solution

Phase difference = (2π/λ) path difference

π = (2π/λ) 5.

But I really have no idea what I’m doing here. The LHS and RHS are not equal. What’s this??:confused:

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