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A man runs round a circular field of radius 50m at the speed of 12 km/hr. What is the time taken by the man to take twenty rounds of the field?

Correct Answer: 220/7 min

Explanation:

speed = 12 km/h =  12 × 5 18 = 10 3 m / s  


 


distance covered =  20 × 2 × 22 7 × 50 = 44000 7 m  


 


time taken  = distance /speed =   44000 7 × 3 10 s e c = 4400 × 3 7 × 1 60 m i n = 220 7 m i n  


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