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765 people could ride the Ferris in 3 hours.
The rate is 255 people per hour.
The unitary method is a process of finding the value of a single unit, and based on this value; we can find the value of the required number of units.
Given that,
20 minutes = 85 people
3 hour (180 minutes) = ?
Let x be the number of people that can ride the ferris wheel in 3 hours.
85 people = 20 minutes
[tex]x[/tex] people = 180 minutes
cross-multiply
[tex]x =\frac{85.180}{20}[/tex]
[tex]x = 765[/tex]
Hence, The number of people that can ride the Ferris in 3 hour is 765.
The rate per hour is 765/3= 255 people per hour.
Hence, 255 people in 1 hour.
To learn more about unitary method from the given link:
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