Ghost...
It'll be reasonably sensible numbers like 15/30 minute chunks as opposed to 78 mins... and the speeds/distances will also be conducive to being able to work out the answer in your head. pretty sure you wont need to resort to long division as mentioned. And its multiple choice too, so the right answer should be obvious even if you're 1/2 kts out.
On the matter of hearing results, at both stage 2 and 3 got told there and then that I'd passed... glad it removed the waiting around, hate that
Best of luck all