Math
posted by Thomas on .
A bicycle wheel is 30 inches in diameter.
a. to the nearest revolution, how many times will the wheel turn if the bicycle is ridden for 3 miles.
b. suppose the wheel turns at a constant rate of 2.75 revolutions per second. What is the linear speed in miles per hour of a point on the tire?

For a...
Circumference = (pi)(d) = 30pi in
3 mi = 190,080 in
190,080 / 30pi = 6336 / pi = 2017 revolutions
Not sure about the second part. 
Part A
(3miles/1)*(5280ft/1mi)*(12in/1ft)*(1rev/15πin) is appx 4033 revolutions
Part B
(2.75rev/1sec)*(60sec/1min)*(60min/1hr)*(15πin/1rev)*(1ft/12in)*(1mi/5280ft) is appx 7.4 mph 
The answers an owl as you at house of jug jug bird y'all finen

Maths is so cool

So this is a sensible answer basically you convert inches into miles which is about 190,080 inches then you do 30 times pie and divide them both