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Two in-phase sources of waves are separated by a distance of 3.68 m. These sources produce...

Two in-phase sources of waves are separated by a distance of 3.68 m. These sources produce identical waves that have a wavelength of 5.28 m. On the line between them, there are two places at which the same type of interference occurs. (a) Is it constructive or destructive interference? (b) and (c) Where are these places located (the smaller distance should be the answer to (b))?

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