How long will a boy take to go four times round a circular field whose radius is 35 m, walking at 5 km per hour?
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Answer:
Radius of field = 35 m
Circumference = 2 πr
2× 22 /7 × 35
220 m = 0.220 m
0.220×2 = 0.880 km = Distance
Speed = 5 km/h
Time = Distance / Speed
0.880 / 5
0.176 hours = 176 hours
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