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1 revolution=1min =distance :2πr
Speed=8.91 km/hour
∴D=s×t=8.91×1000×1m
=8910m
∴ In 60min, distance=8910m
∴ In 1min, distance= 8910/60 =148.5m
∴2πr=148.5
∴r= 148.5/2×3.14
∴D=2×r=2× 148.5/2×3.14
D=47.2m.
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