SOLUTION: In car front & rear wheel diameter is 21 &24 cm find no. Of revolution that the rear wheel makes to cover the distance which front wheel covers in 21 cm at a speed of 252km per ho

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Question 1023896: In car front & rear wheel diameter is 21 &24 cm find no. Of revolution that the rear wheel makes to cover the distance which front wheel covers in 21 cm at a speed of 252km per hour
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Here is what I think you mean here:
In a car the front & rear wheel diameter is 21 & 24 cm.
Find the no. of revolutions that the rear wheel makes to cover the distance which front wheel covers in 2 sec at a speed of 252km per hour
:
Find the circumference of both wheels:
pi%2A21 = 65.973 cm
pi%2A24 = 75.398 cm
:
Find the distance in meters traveled in 2 sec at 252 km/hr
2 * %28252%2A1000%29%2F3600 = 140 meters
Change to cm: 140*100 = 14000 cm
:
Find the no. of rev the rear wheel makes to travel 14000 cm
14000%2F75.398 = 185.7 rev
During this time the front wheel travels the same dist but makes
14000%2F21 = 212.2 rev
:
note that the ratio of the rev of the two wheels
185.7/212.2 = .875 the same as 21/24 = .875