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A coach company runs a service that connects two towns, Alphaton (A) and Betaville (B), which are $90$ miles apart.
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The timetable below gives details of coaches travelling from A to B:
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Coaches going from B to A leave at the same times: | |||||||||||||||||||||||
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How many of this company's coaches travelling in the opposite direction does the $10$ am coach from A pass before reaching B?
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