Question

The number of revolutions made by a wheel of diameter $56cm$ in covering a distance of $1.1km$ is $(Use\pi =\frac{22}{7})$

• A. $31.25$
• B. $56.25$
• C. $625$
• D. $62.5$

Answer 1

The correct option is C $625$

Diameter $=56cm$

Radius $=28cm$ (half of diameter)

$1.1km=1,10,000cm$

Then, total distance covered in one revolution $=2\pi r=2\times \frac{22}{7}\times 28cm=176cm$

Hence, total no. of revolutions $=\frac{110000}{176}=625$