A car travelling at 10" ms"^(-1) sounds ...

A car travelling at `10" ms"^(-1)` sounds a horn, which has a frequency of 500 Hz, and this is heard in another car which is travelling behind the first car in the same direction, with a velocity of `20" ms"^(-1)`. The sound can also be heard in the second car be reflection from a bridge ahead. What frequencies will be driver of the second car hear ?
[Speed of sound in air `=340" ms"^(-1)`]

514 Hz, 528 Hz

514 Hz, 545 Hz

509 Hz, 545 Hz

528 Hz, 564 Hz.

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