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A car moving at a velocity of 17 ms^(-1)...

A car moving at a velocity of `17 ms^(-1)` towards an approaching bus that blows a horn at a frequency of 640Hz on a straight track. The frequency of this horn appears to be 680 Hz to the car driver. If the velocity of sound in air is `340ms^(-1)`, then the velocity of the approaching bus is

A

`2ms^(-1)`

B

`4 ms^(-1)`

C

`8 ms^(-1)`

D

`10 ms^(-1)`

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