Two 100-m, in-phase spherical wave sources are located at point p in the figure. An observer is located at point o, a distance of 10 m in the…

Two 100-m, in-phase spherical wave sources are located at point p in the figure. An observer is located at point o, a distance of 10 m in the positive y-direction away from point p. If one of the wave sources moves at 2 m/s along a line 45º from the x axis, how long will it be before the observer detects another maximum. There may be more than one correct answer.
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