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A road runs midway between two parallel ...

A road runs midway between two parallel rows of buildings. A motorist moving with a speed of 36 Km/h sounds the horn. He hears the echo one second after he has sounded the horn. Find the distance between the two rows of buildings. (velocity of sound in air is 330 m/s)

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`80 sqrt17m`
`485 Hz and 515 Hz`
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