A car driver, driving in a fog, passes a...

A car driver, driving in a fog, passes a pedestrian who was walking at the rate of 2 km/hr in the same direction. The pedestrian could see the car for 6 minutes and it was visible to him up to a distance of 0.6 km. What was the speed of the car?

15 km/hr

30 km/hr

20 km/hr

8 km/hr

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