Woops! Probably should have mentioned that the Aircraft are on a head to head track!
No worrys, heres my best shot.....
Ok, for the first 10mins only Aircraft A is moving (350mph) - in that time it would have travelled 58 miles. The distance between the Aircraft is now only 542 miles (600-58). With A/C A at 350mph and B at 285mph, the closing speed is now 635mph (350+285). From this point it will take (542miles/635mph) 51mins to meet. to find where they meet, best we use Aircraft B - It has been travelling for 51mins at 285mph so it has travelled 243 miles. VOILA! We have now answered the second part of our question.
So what time is it? It has been 51mins since B took off however A/C A took off 10mins prior at 1100hrs - a total of 61mins has elapsed. BINGO! Therefore our final answer is 1201hrs and 243 miles form station B (at least I hope that is the answer!)
Remember that this is at the higher end in terms of difficulty and there would have been a number of easier variations of this previously in the test. The actual test does use more user-friendly numbers - most times and speeds work out to be a multiple of 5 (this eliminates inaccuracies caused by rounding), but practice using oddball numbers and it will seem that much easier when you reach Cranwell.
Enjoy.
Last edited by Aynayda Pizaqvick; 14th Jul 2002 at 00:36.