A man in car notices that he can count 25 telephone posts in 1 min. If they are known to be 40 m apart, then at what speed is the car travelling?

52.4 km/h
57.6 km/h
48.2 km/h
44.9 km/h

Correct Answer: 57.6 km/h

Explanation:

Number of gaps between 25 telephone posts = 24
Distance travelled in 1 min = 40 x 24 = 960 m
Speed = (960 x 60)/1000 = 57.6 km/h

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