A cyclist in a fog passed a man running at the rate of 6 km/hr. in the same direction.He could see the cyclist for 5 min.and it was visible to him upto a distance of 100 m. What was the speed of the cyslist ?
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7.20 km./hr.
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8.4 km./hr.
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8.5 km./hr.
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9 km./hr.
A
Correct answer
Explanation
The cyclist and runner move in the same direction. The relative speed covers the visibility distance of 100 m in 5 minutes. Relative speed = 100m/5min = 20 m/min = 20 × 60/1000 km/h = 1.2 km/h. Since runner's speed is 6 km/h, cyclist's speed = 6 + 1.2 = 7.2 km/h. Option A is correct.