Question: 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

Two trains move towards each other with the same speed. The speed

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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