A car sounding a horn of frequency 1000 ...

A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11 : 9. If the speed of sound is v , the speed of the car is

`1/10 v`

`1/2 v`

`1/5 v`

`v`

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