SOLUTION: Your car came equipped with 17 inch radius tires. You upgrade to 20 inch wheels and tires. Your speedometer was not adjusted. When you think your speed is 60 mph, How fast are y

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Question 512020: Your car came equipped with 17 inch radius tires. You upgrade to 20 inch wheels and tires. Your speedometer was not adjusted. When you think your speed is 60 mph, How fast are you really going?
Figure the number of inches per revolution of the tire to the mph. How many Revolutions would it take in one hour to cover 60 miles?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Your car came equipped with 17 inch radius tires.
You upgrade to 20 inch wheels and t
When you think your speed is 60 mph, How fast are you really going?
:
The circumference is directly proportional to the diameter to the wheel
Let s = speed with 20" wheels
17%2F20 = 60%2Fs
Cross multiply
17s = 20*60
s = 1200%2F17
s = 70.6 mph
:
Figure the number of inches per revolution of the tire to the mph.
c = 20%2Api
c = 62.832 inches per revolution
:
How many Revolutions would it take in one hour to cover 60 mile
%2860%2A5280%2A12%29%2F62.832 = 60,504.2 revolutions (with a 20" wheel)