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There are two horns H1 and H2 in a car. ...

There are two horns `H1` and `H2` in a car. When sounded together, the driver records `35` beats in `10` second. With horn `H2` blowing and car moving towards a wall at a speed of `5 ms^( –1)`, the driver noticed a beat frequency of `5 Hz` with the echo. When frequency of `H1` is decreased the beat frequency with two horns sounded together increases. Calculate the frequency of two horns. Speed of sound `= 332 ms^( –1)`

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