How Many Revolution will It Make to Travel?

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

  1. 24200
  2. 30000
  3. 50000
  4. 42500
Anurag Mishra Professor Asked on 1st August 2015 in Maths.
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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.

Anurag Mishra Professor Answered on 1st August 2015.
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