@ Whirlygig.
Thank you for the reply and help.
The Oxford Assessment Math section gives me 24 questions for 20 minutes, which gives me about 50 seconds per Ques.
I doubt they'd give me a question like the one I posted, but I will nevertheless be prepared for it.
Thank you again.
FlyingVix, much appreciated!
Anyone who has undergone the Math/Physics section from Oxford themselves?