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A person observed that he required 30 seconds less time to cross a circular ground along its diameter than to cover it once along the boundary. If his speed was 30 m/ minutes. then the radius of the circular ground is (Takeπ=22/7):
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Explanation:
Distance covered in 30 seconds
=30m/min×30/60=15m
This is the difference of distance of the boundary and the diameter
Let ‘R’ be the radius
2πR−2R=15
2R(π−1)=15
2R=15/π−1=15/ 22/7−1
=15×7/15=7
R=7/2=3.5m