how do I solve this trig problem. This is about time of descent. I don't know how to work in the with the distance traveled. Per practice question , " A submarine traveling at 9 mph ( miles per hour) at an angle of depression of 8 degrees. How many minutes , to the nearest tenth, does it take the submarine to reach a depth of 150 feet?

1 mile is equal to 5280 feet. I don't know how to equate or work in the time . I realize this has to do with trig function of the 8 degree angle, I'm confused. any help would be appreciated.