Thank you so much. Being so good at easy and medium-sized problems is so much better than trying to get hard problems correct. Thanks again.
@manhattanprepgmat6791
4 жыл бұрын
Wonderful to hear!
@DrSJH159
5 жыл бұрын
I actually laughed out loud at the last question
@sebastiann7883
4 жыл бұрын
The last question is not that impossible actually. The answer choices are far enough away from each other to ballpark everything using 3 for the value of pi. If you have the radius you also know that the track has a length of a little more than 60 miles (10*2*3). You also know that once A is in motion, B has already done 20 miles, or 10 hours (10*2). Now the distance between A and B plus 12 additional miles is 52 miles to cover at a combined rate of 5 miles per hour. So the time both cars travel at the same time has to be something around 10-11. The question asks for the time CAR B is moving, so you have to add the 10 hours Car B has been in motion before Car A. So the answer is something around 20-21. The answer choices, plugging in 3 and simplifying, are: A) 4*3-1.5 = 10.5 B) 4*3+8.5 = 20.5 C) 4*3+10.5 = 22.5 D) 2*3-1.5 = 4.5 E) 2*3-1.0 = 5 The answer that makes most sense is B. Thanks to the help of @Will C below we could spot a trap answer in option A, which I first believed to be true. If you solve for car A or stop your process at knowing the time both cars are in motion you would think its A, answering a question they're not asking.
@willc2535
3 жыл бұрын
B left first though, so it's around 21 hours, right? I think B is the answer. I think it also helps if you visualize the car's path as a straight line with length 63 rather than a circle, once you figure out the length the shape only obscures the solution.
@sebastiann7883
3 жыл бұрын
@@willc2535 Car B has driven 20 miles already as soon as both cars are in motion. The track is 60 miles and after passing each other they have to be 12 miles away from each other. So combined that would be 72 miles, minus 20 already done by car B is 52 miles. Now, divide the 52 miles they have to cover by the combined rate and you have the answer.
@willc2535
3 жыл бұрын
@@sebastiann7883 you're solving for car A though, it should be for car B. The initial 10 hours count towards the answer
@sebastiann7883
3 жыл бұрын
@@willc2535 checked it today and you are 100% right. I totally ignored the 10 hours at the beginning in my process. 'A' would be sort of the trap-answer for incomplete process, or solving for car A. I'll change the initial post, so nobody takes it for being correct. Thank you very much!
@jordanlewisbaker
5 жыл бұрын
woooooo! ceilidh is the best GMAT instructor ever!
@lb6682
4 жыл бұрын
Thank you so much! Whats the correct answer for the last problem?
@vijitharanvallipavan4734
4 жыл бұрын
I just took an educated guess and said A... what did you get?
@abhibarua5437
3 жыл бұрын
The correct answer is B.
@teetertotter5787
3 жыл бұрын
Good info. Thanks. Too many "um" made it challenging though.
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