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A motorcyclist set off from a city A to the airport.
By 4 p.m. , `3/5` of his journey was completed and at that time, he passed a cyclist who was also travelling in the same direction.
The average speed of the cyclist was 24 km/h.
By 6 p.m. , the motorcyclist reached his destination but the cyclist lagged behind by 12 km.
If the cyclist had also started from the city, how long would it take him to travel from the city to the airport ?