Question 74

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

Solution

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Let speed of car = 'x' km/h

Effective speed when car and pedestrian travelling in the same direction = (x - 2)

Since the pedestrian could see the car up to a distance of 0.6 km. So, total distance distance = 0.6 km

Now, 

$$(x - 2) * \frac{6}{60} = 0.6$$

(x - 2) = 6

x = 8 km/h

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