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I got r=44.82 inches is it correct?

how many revolutions per hour does it make?

5 rev per hour

really? it does 300 revs in one minute; how can it do way less revs in one hour?

300*60 ...

sorry for that I interchanged it :)
18000 per hour

18000 revs in one hour put to the ratio of 80 miles
18000/80 is our next step i believe

of if we knew how many inches 80 miles was we could go more directly to an answer ....

why did you made it into ratio?

1 rev = the circumference of the wheel

sorry I got confused :)

Sorry, but I am really confused with your method. :)
I did angular and linear speed with this one.

i did the same, i converted angular (rpm) into linear (miles, inches)

of course i get about a wheel that is about 7 feet in diameter lol

44.82, yes

and I think your method is faster :)