You need to use the vertical component of the plane's velocity, which is feet per second, to calculate the time taken to reach a certain altitude.
When an airplane leaves the runway, its angle of climb is 20° and its speed is 335 feet per second. How long will it take the plane to climb to an altitude of 10,000 feet? 16,000 feet?
Here is how I am thinking about it:
335 * 60 = 20100
then 10,000 / 335 = 29.85 seconds.
I am not sure if this is right but it is a guess. Could some one help me.