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[" Amand ther whilles the trains,one lea...

[" Amand ther whilles the trains,one leaving and the other coming in with oqual speeds of "4m/sec" .If they "],[" sound ther whiles,coch of frequency "240Hz" ,the number of beard by the man (velocity of "],[" sound in are "220m/sec" ) will be equal to "],[[" (1) "6," (2) "3," (3) "0," (4) "12]]

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