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Oh, dude, it's like you're asking me to do math or something. Okay, so, 5280 in expanded notation is 5 x 1000 + 2 x 100 + 8 x 10 + 0 x 1. There you go, all broken down for you. Math lesson with a side of sarcasm, you're welcome.
5,280 = (5 x 1000) + (2 x 100) + (8 x 10) + (0 x 1)
There are 5280 feet in one mile and 60 minutes in one hour so take the value given in feet per minute and divide by 5280 then multiply by 60. y(mph) = x(ftpm) x 60 / 5280 = 0.113636364x.
5,280 = (5 x 103) + (2 x 102) + (8 x 101) + (0 x 100)
5280 x 25 x 12/3600 ie 440 feet