The number of rounds that a wheel of diameter yy m will make in going 4 km is

- a)1500
- b)1700
- c)2000
- d)2500

Correct answer is option 'C'. Can you explain this answer?

48 Answers

Mohamed Azeem
answered
Apr 25, 2020

Diameter=yy meters

So, radius=yy/2 meters

Distance=4 km, so 4000 m

Soln:

Circumference of circle is

2 x pi x radius

=> 2 x (22/7) x (yy/2)

=>yy = 7/22 x 2/2

yy = 14/44

yy = 7/11

yy/2 =7/22

So, circumference = 2 meters

For 2 meters = 1 rotation

So, 1 meter = 1/2 rotation

Rotation made in 4000 meters is

= 1/2 x 4000

= 2000

Hence proved!!!

So, radius=yy/2 meters

Distance=4 km, so 4000 m

Soln:

Circumference of circle is

2 x pi x radius

=> 2 x (22/7) x (yy/2)

=>yy = 7/22 x 2/2

yy = 14/44

yy = 7/11

yy/2 =7/22

So, circumference = 2 meters

For 2 meters = 1 rotation

So, 1 meter = 1/2 rotation

Rotation made in 4000 meters is

= 1/2 x 4000

= 2000

Hence proved!!!

Mohit Bansal
answered
Dec 25, 2019

I think without diameter or radius.. it is not possible to find out the answer

Drishti Kumari
answered
May 15, 2020

I think there should be numerical value of diamter in place of this variable i.e , yy . Please check your question .

Senbagam Senbagam
answered
Aug 19, 2020

If you say the exact value of the diameter I'll try to answer it

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