Two Motors in a Factory Are Running at Slightly Different $786.0 \mathrm { rpm } \text {. }$

Two motors in a factory are running at slightly different rates.One runs at 825.0 rpm and the other at $786.0 \mathrm { rpm } \text {. }$ You hear the sound intensity increase and then decrease periodically due to wave interference.How long does it take between successive instances of the sound intensity increasing?

A) 1.54 s
B) 1.43 s
C) 1.66 s
D) 1.79 s

Correct Answer:

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