The diameter of a 120 cm long roller is 84 cm. if it takes 1000 complete revolutions to level a playground having breadth of 36 m, find the length of the playground.
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Radius(r)=diameter/2=84/2=42cn
Height of the roller(h)=120cm
C.S.A=2πrh=2*(22/7)*42cm*120cm
=31680cm^2
Area of the playground having breath 36m(A)= l*b
3600Lcm^2
No. Of complete revolutions(N)=1000
or, C.S.A/A=1000
or,31680/3600L=1000
or,L=31680/3600000
or, L=0.0088cm/0.88m
Hence, the length of the playground is 0.88m
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