# Two trains moves towards each other with the same speed. Speed of sound is 340 m//s^(-1). If the pitch of the tone of the whistle of one when heard

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Two trains moves towards each other with the same speed. Speed of sound is 340 m//s^(-1). If the pitch of the tone of the whistle of one when heard on the end other changes to 9//8 times, then the speed of each train is :

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Correct Answer - 20 m//s