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9 Two towns a and b are connected 2 points by a regular bus service with a busleaving in either direction every Tminutes. A man cycling with a speedof 20 km per hour in the direction ato b notices that a bus goes past himevery 18 minute in the direction of hismotion, and every 6 minut in theopposite direction. What is theperiod t of the bus service and withwhat speed do the buses ply on theroad |
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