A car driver driving in fog, passes a pedestrian who was walking at the rate of 2km/h in the same direction. The pedestrian could see the car for 6 mins and it was visible to him up to a distance of 0.5 km. The speed of the car would be:
Explanation:
Let the speed of car = x kmph
Their relative speed = (x – 2) kmph
Relative distance travelled is 0.5 km in 6 mins = 0.1 hour
∴ (x - 2) = 0.5/0.1 = 5 kmph
∴ x = 7 kmph
Hence, option (a).
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