Question

The diameter of a wheel of a car is 84 cm . Find the number of revolutions it makes to travel 66 km.

Answer 1

Answer:

Step-by-step explanation:

Diameter=84cm

Radius=42cm

Perimeter=2*22/7*42=264cm

66km=6600000cm

No.of revolution=6600000/264=25000

The no.of revolution travel by the car in 66km is 25000

Answer 2

The wheel will take 25000 revolutions to travel 66 km.

Given:

the diameter of the wheel = 84 cm

To Find:

the number of revolutions it takes for the wheel to travel 66 km

Solution:

the radius of the wheel will be = 84/2 = 42

thus, the circumference of the wheel will be = 2 × π × 42

= 264 cm

so, the distance covered by the wheel in 1 revolution = 264 cm

now, we know that 1 km = 100000 cm

⇒ 66 km = 6600000 cm

so, revolutions made to cover  6600000 cm =  6600000/264 = 25000

Thus, the wheel will take 25000 revolutions to travel 66 km.

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