two trains move towards each other sith ...

two trains move towards each other sith the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes 9/8 times, then the speed of each train should be

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The correct Answer is:

`20 m//s`

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RESONANCE ENGLISH-SOUND WAVES-Exercise- 1 PART - I

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