Question

The length of a roller of levelling the soil is 91 cm and radius of its circular path is 30 cm. This roller rolls 100 on the soil then how much squares metre of soil is levelled?

Answer 1

1

Secondary SchoolMath8 points

A road roller is 140cm long .Its diameter is 84 cm . It takes 1000 complete revolutions once over to level the road. Find the cost of levelling the road at Rs 50 per 100 square metres

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Ask for details FollowReport byAka3jdshitajainly 02.03.2017

Answers



abhi178

Area covered in one complete revolution =surface area of road =2pi.r.h
=2 x 22/7 x 42 x 140 cm^2 
=12 x 22 x 140 cm^2 
=36960 cm^2

covered area in 1000 revolution =1000 x surface area of road roller =36960 x 10^3 cm^3 
=3696 m^2 

now,
cost = surface area of roller x rate 
=3696 x 50/100 =1848 Rs