Question

A roller of diameter $1.4$m and length $1.4$m is used to press the ground having area $3080$ sq.m. Find the number of revolutions that the roller will make to press the ground.

• A. $700$
• B. $500$
• C. $1000$
• D. $800$

Answer 1

The correct option is B $500$

Diameter of roller $=1.4m$

radius $\left(r\right)=0.7m$

Length $\left(l\right)=1.4m$

Curved surface area$=2\pi rl=\frac{44\times 14}{100}sq.m$

Ground Area $=3080,m^2$

Number of revolutions = $\frac{3080\times 100}{44\times 14}=500$