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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

A

`10ms^(-1)`

B

`40ms^(-1)`

C

`20ms^(-1)`

D

`15ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
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