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[" (a) "55km/hr" (b) "57km/hr" (c) "60km/hr" (d) "63km/hr],[" 13.Sound is said to travel in air at about "1100" feet per second.A man hears the axe "],[" striking the tree,"(11)/(5)" seconds after he sees it strike the tree.How far is the man from "],[" the wood chopper? "]

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