A Ferris wheel is boarding platform is 4 meters above the ground, has a diameter of 72 meters, and rotates once every 10 minutes.
How many minutes of the ride are spent higher than 48 meters above the ground?
Round to three decimal places.
from what you have said, since the period is 10 minutes, the height is
h(t) = 40-36cos(π/5 t)
so now you can use that to answer the question.