The third-tallest Ferris Wheel in the world is the London Eye in England.?

Update: The height (in metres) of a rider on the London Eye after t minutes can be described by the function h(t) = 67sin [12(t + 0.0223)] + 70.

a.
At what time(s) will the rider be at the bottom of the Ferris wheel?
b
How long does it take for the Ferris wheel to go through one rotation?
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