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A train moves towards a stationary obser...

A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by an observer is `f_1`. If the train's speed is reduced to 17m/s, the frequency registered is `f_2`. If the speed of the sound is 340 m/s then the ratio `f_1//f_2` is :

A

`19//17`

B

`1//2`

C

`2`

D

`19//18 `

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