Question

A car has to travel 0.121 km to reach from A to B. If the radius of the tyre is 7 cm. how many times will the tyre rotates while the car travels form A to B?​

Answer 1

Answer:

Circumference of tyre = 2 πr = Distance travelled in each rotation =

2

×

22

7

×

7

= 44 cm.

Total distance covered = Number of rotations

×

Circumference of tyre

Number of rotations =

0.121

k

m

44

c

m

=

0.121

×

1000

m

44

×

0.01

m

=

275

Answer 2

Answer:

Circumference of tyre = 2 πr = Distance.

travelled in each rotation = 2 × 22/7 = 44 cm.

Total distance covered = Number of rotations × Circumference of tyre.

Number of rotations = 0.121 km/44 cm

= 0.121 × 1000 cm/44 × 0.1 m

= 275.