you know that when they meet their distance travelled will be the same so you would have SxT=SxT for both of the planes so you substitute in to get 175x(T+45) = 235xT then rearrange to solve. there are a few ways of doing it you just have to think outside the box, i was stumped when i first looked at the question but when you stop and think about it, it's not too daunting. I'm sure the questions won't be this hard on the day though.
Has anyone got their assessment at oat on the 26th and 27th of feb?
Good luck to all of you.