Question 61

The diameter of a wheel is 49 cm. The number of revolutions in which it will have to cover a distance of 770 m, is:

Solution

Given, diameter of the wheel = 49 cm

Perimeter of the wheel = 49$$\pi =49\times\frac{22}{7}=154$$cm

Distance to be covered = 770 m = 770$$\times$$100 cm

$$\therefore\ $$The number of revolutions in which it will have to cover a distance of 770 m = $$\frac{770\times100}{154}=500$$

Hence, the correct answer is Option B

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