Question

Find the distance covered by a motorbike if its tyres are of radii 14 dm each and took 7500 revolutions to cover the distance.​

Answer 1

Here's how to solve the problem:

First, convert the radii of the tires from decimeters (dm) to centimeters (cm). Each decimeter is equal to 10 centimeters, so the radius of each tire is 14 dm x 10 cm/dm = 140 cm.

The distance covered by the motorbike is equal to the circumference of one tire multiplied by the number of revolutions. The circumference of a circle is equal to 2πr, where r is the radius of the circle. So the distance covered is:

distance covered = 2 x π x 140 cm x 7500 revolutions distance covered = 6600000 cm

Therefore, the distance covered by the motorbike is 6,600,000 centimeters (or 66 kilometers). The answer is c) 6,600,000 centimeters (or 66 kilometers).

Explanation: