Asked by Lost In Studies

There are two wheels with diameter 30 inches and 20 inches. The first wheel covers a certain distance in 240 revolutions. In how many revoluions would the second wheel cover the same distance?
Answered by bobpursley
dwould it be proportional? The linear distances their circumferences are in a set proportion.

30/240=20/N

Answered by Lost In Studies
bobpursley,

Thanks for your responce and help, I don't think so it's proportional. Since the answer is 360 revolutions.
And putting them in proportions doesn't give the correct answer.


A friend told me this solution;
Find the circumference of both the wheels by formula 2 pi r:

1st wheel: 94.2 inches.
2nd wheel: 62.8 inches.

Now multiply the circumference of the 1st wheel by revolutions:
94.2*240 = 22608 inches.

This would be the otal distance traveled by wheels.

Now divide the distance by the circumference of second wheel,
you'll get no. of revolutions:

No. of revolutions: 22608/62.8
No. of revolutions: 360 revolutions.
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