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Sagot :
Circumference = πd, where d = diameter
we know the wheel has a diameter of 27 inches, so the total circumference is 27π, and that's the arc length of one revolution.
there are 5280 feet in 1 mile and 12 inches in 1 foot.
so in 40 miles there are 40(5280)(12) inches.
and we also know that there are 60 minutes in 1 hour.
[tex]\cfrac{40~miles}{hour}\implies \cfrac{~~ \frac{40(5280)(12)~in}{27\pi ~\frac{in}{rev}}~~}{60~minutes}~~\approx ~~\cfrac{29878.688~rev}{60~minutes}~~ \approx ~~497.978~\frac{rev}{minute}[/tex]
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