How long will it take for sound waves to...

How long will it take for sound waves to travel the distance `l` between points A and B if the air temperature between them varies linearly from `T_(1)` to `T_(2)`? The velocity of sound at `T_(0)` is `C_(0)`.

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The correct Answer is:

`t=(2l)/C_(0). sqrt(T_(0))/(sqrt(T_(1))+sqrt(T_(2)))`

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