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two trains move towards each other with 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

A

`20 m//s`

B

`2 m//s`

C

`200 m//s`

D

`2000 m//s`

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