# How Many Revolution will It Make to Travel?

Answered

The diameter of the wheel of a car is 77 cm. How many revolution will it make to travel 121 km?

- 24200
- 30000
- 50000
- 42500

Best answer

**Answer: (3) 50000**

**Explanation:-**

The diameter of wheel car = 77 cm

Then, the radius of wheel car = 77/2 cm

The distance covered by wheel car in one revolution = 2 x pai x r = 2 x 22 x 77/7 x 2

= 22 x 11

= 242 cm

1 cm = 1/100 m

Therefore, 242 cm = 242/100

= 2.42 m

Total distance covered by car = 121 km

1 km = 100 m

Therefore, 121 km = 121 x 1000

= 121000 m

The number of revolution of wheel = 121000/2.42

= 50000

Hence, the answer is (3) 50000.