So you have:
As far as converting 101.5 degrees to seconds? You would just multiply 101.5 by 60*60.
However, I'm not sure if that's what the question is asking. I am assuming that the function is defined as h(t), where h is the height in meters and t is the time in seconds. So, you don't need to convert anything. (I'm just assuming because no normal Math question would ask that.) The answer would just be whatever you solve for t (unless t is not defined as seconds).
Hope that clarified things