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Periodicity of algebraic models

Divya is seated on a Ferris wheel at time t=0t=0. The graph below shows her height, hh, in meters, tt seconds after the ride starts.
Approximately how long does it take Divya to complete one revolution on the Ferris wheel?
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
seconds