A sound source is located somewhere along the x-axis. Experiments show that the same wave front simultaneously

Question:

A sound source is located somewhere along the x-axis. Experiments show that the same wave front simultaneously reaches listeners at x = -7.0 m and x = +3.0 m.
a. What is the x-coordinate of the source?
b. A third listener is positioned along the positive y-axis. What is her y-coordinate if the same wave front reaches her at the same instant it does the first two listeners?

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