The formula = ℎ∙∙∙ 35000 gives the approximate size in kilobytes (Kb) of a compressed video. The variables h and w represent the height and width of the frame measured in pixels, f is the number of frames per second (fps) the video plays, and t is the time the video plays in seconds. Estimate the time a movie trailer will play if it has a frame height of 329 pixels, has a frame width of 144 pixels, plays at 15 fps and has a size of 2370 Kb.​