Question

Diameter of a bike wheel is 80 cm. Number of complete rotations the wheel makes to cover a distance of 176 m is

• A. 55
• B. 70
• C. 120
• D. 80

Answer 1

The correct option is B

70

Given, diameter of wheel = 80 cm
Circumference = $\pi d$ = $\frac{22}{7}$ x 80 cm = $\frac{1760}{7}$cm

Given, total distance covered
= 176 m = 176 x 100 cm [Since 1 m = 100 cm]

Total distance = Distance covered in one rotation(Circumference) x No. of rotations
$\Rightarrow 176\times 100=\frac{1760}{7}$ x No. of rotations

$\therefore$ No. of rotations = $\frac{176\times 100\times 7}{1760}$ = 70
Therefore, the wheel makes 70 complete rotations to cover 176 m distance.