Question

a person runs a circular path of radius 21m in 44 second then find the speed in km/hr

Answer 1

total distance covered = 2× π × radius
= 2×22/7×21=44×3 m
now speed = distance / time
= 44×3/22=6 m /sec
6 × 18/ 5= 108/5= 21.6 km /hr

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Answer 2

after use formula of speed we find Speed = 21.6