Buses leave the airport every 3 minutes to travel to the city centre. A car leaves the airport at the same time as one bus and travels to the city centre by the same route. It takes each bus 60 minutes and the car 35 minutes to travel from the airport to the city centre. How many of these airport buses does the car overtake on its way to the city centre, excluding the bus it left with?
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Grey Kangaroo 2017 (2017)
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