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A city bus left a bus stand and drove towards the railway station.
15 minutes later a taxi left the same spot and drove towards the railway station at an average speed of 30 km/h.
The bus was 5 km away from the railway station when the taxi reached the railway station at 12.45 p.m. .
What was the average speed of the bus if it left the bus stand at 11.30 a.m. ?