Congrats on passing your exam! If you had a lot of questions like the one you asked on the exam, I can see why you are so excited.

As for the problem, I worked it out and came up with 2 answers, neither of which are probably close. I worked it out one way and got 31.7 seconds, and another way I got 1.7 seconds. I am going to go with the first answer of 31.7 seconds.