The diameter of a wheel is 40 cm. How many revolutions will it make in covering 176 m?

(a) 140

Distance covered by the wheel in 1 revolution $=\pi d$

$=\left(\frac{22}{7} \times 40\right) \mathrm{cm}$

$=\frac{880}{7} \mathrm{~cm}$

$=\frac{880}{7 \times 100} \mathrm{~m}$

Number of revolutions required to cover $176 \mathrm{~m}=\left(\frac{176}{\frac{880}{7 \times 100}}\right)$

$=\left(176 \times 100 \times \frac{7}{880}\right)$

$=140$