Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
05 Jun 2006, 11:54
1
This post received KUDOS
13
This post was BOOKMARKED
00:00
A
B
C
D
E
Difficulty:
45% (medium)
Question Stats:
68% (03:04) correct
32% (02:02) wrong based on 357 sessions
HideShow timer Statistics
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time will the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
Re: A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
05 Jun 2006, 12:13
1
This post received KUDOS
1
This post was BOOKMARKED
buckkitty wrote:
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time wil the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
I would love to know the approach you guys take to solving this. I approached it a little differently from the book. The source is MGMAT word problem translations book.
B -
The bullet train will have travelled 240 x (10/60) miles after the first 10 minutes = 40 miles.
At 12:10 , the bullet train and the train are 260 miles apart (=300-40). To calculate when they will pass:
260 = 240*(60)*x + 160*(60)*x where x = the time it takes for them to reach one another in minutes
x = 39 minutes for the trains to pass each other AFTER 12:10.
Therefore the trains must have passed each other at 12:49
Re: A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
05 Jun 2006, 12:20
1
This post received KUDOS
Let distance travelled by A be x miles
Speed A = 240/60 = 4 miles per minue
Speed B = 160/60 = 8/3 miles/min
time = distance/speed
Distance travelled by A in 10 minutes = 40 miles.
A bullet train leaves Kyoto for Tokyo traveling 240 miles [#permalink]
Show Tags
27 Sep 2008, 01:04
1
This post was BOOKMARKED
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time wil the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
_________________
"You have to find it. No one else can find it for you." - Bjorn Borg
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time will the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
!)Train K starts from Kyoto at 12:00 noon. It moves at the speed of 240 mph. Say it covers 300-x miles
2)Train T starts from Tokyo at 12:10 PM at a speed of 160 mph. Say it covers the rest of x miles
From (1) we have 300-x = 240(t+1/6) [ we have "+1/6" here since Train K travels 10 minutes or 1/6 hours longer than train T]
and From (2) we have x=160t
combining above two equations: 300-160t=240t + 40 260 = 400t
t= 26/40 = 13/20 hours = (13/20)*60 = 39 mins.
12:10 + :39 = 12:49
_________________
"You have to find it. No one else can find it for you." - Bjorn Borg
14) A bullet train leaves kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour.If Tokyo and Kyoto are 300 miles apart, at what time ill the trains pass each other?
a) 12.40 pm b) 12.49 pm c) 12.55 pm d) 1.00 pm e) 1.05 pm
Catch up time= Distance between the 2/Speed of Train from K->T + Speed of Train from T->K
300/240+160 = 45 mins as Train from T->k started 10 mins late catch up time will be 12.55 If i calculate with other method
240(t+1/6)+ 160t = 300
i got t as 39 mins
as Train from T->k started 10 mins late catch up time will be 12.49
WHEN CAN WE APPLY THE FORMULA TO CALCULATE Catch up time because in this case its not giving correct answer.
_________________
The proof of understanding is the ability to explain it.
300/240+160 = 45 mins ---> This is wrong You are assuming that train K->T started the same instant that the train T->K started. So train T->K traveled 1/6 * 160 miles more and hence the "kiss" time went down by 4 mins. i.e. 45 mins. However the actual time to intersect is 49 mins.
as Train from T->k started 10 mins late catch up time will be 12.55 --->
When using the relative speed you assumed if one train were still, the other train will catch up at effectively 400 mph. So 400/6 miles is covered in 1/6 hr. This cannot be undone by simple arithmetic as adding 10 mins to the time of intersect. This doesn't work.
In fact the correct assumption is that for the first 1/6 hr (10 mins), the slower train was still and only the faster train was moving.
GMATD11 wrote:
14) A bullet train leaves kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour.If Tokyo and Kyoto are 300 miles apart, at what time ill the trains pass each other?
a) 12.40 pm b) 12.49 pm c) 12.55 pm d) 1.00 pm e) 1.05 pm
Catch up time= Distance between the 2/Speed of Train from K->T + Speed of Train from T->K
300/240+160 = 45 mins as Train from T->k started 10 mins late catch up time will be 12.55 If i calculate with other method
240(t+1/6)+ 160t = 300
i got t as 39 mins
as Train from T->k started 10 mins late catch up time will be 12.49
WHEN CAN WE APPLY THE FORMULA TO CALCULATE Catch up time because in this case its not giving correct answer.
train A-------------------B r: 240 ------------------160 t: t+10/60=t+1/6 --------t (cause A moved 10 mins ealier) S: 300-[240*(t+1/6)-----160 t 300-240t-40=160t so t=1 hour and 5 mins
from what i learned from MGMAT this is " the kiss/ crash"
Time taken to meet = Distance/relative speed Second train started 10 minutes later, the first train travels in 10 minutes = 240/60*10=40 miles so they have to travel 300-40=260 miles now, time= [260/(240+160)]*60= 39 minutes as 10 minutes later 39+10=49 minutes
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
26 Feb 2016, 04:51
buckkitty wrote:
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time will the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
This is a very beautiful question for any student of clear thinking. You could apply the right strategy/formular and blow the solution by an error in the not very short solution process. Rate x Time = Distance Either \(240t + 160(t - 1/6) = 300\)
OR \(240(t + 1/6) + 160t = 300\)
will give you the solution; the first gives you t = 49 and the second gives you t = 39. The first is straight forward without a trap cos it came straight out from the wording of the question without manipulation. You might say the second is great since you were aware that you must add \(\frac{(1}{6)}\)hours to it. Well,in a CAT, if you had got an answer choice that says 12:39pm then you might have fallen into the trap and FAILED THE QUESTION pitifully with your head held high. I would always want to follow the question prompt like I'm not too smart.
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time will the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
This is a very beautiful question for any student of clear thinking. You could apply the right strategy/formular and blow the solution by an error in the not very short solution process. Rate x Time = Distance Either \(240t + 160(t - 1/6) = 300\)
OR \(240(t + 1/6) + 160t = 300\)
will give you the solution; the first gives you t = 49 and the second gives you t = 39. The first is straight forward without a trap cos it came straight out from the wording of the question without manipulation. You might say the second is great since you were aware that you must add \(\frac{(1}{6)}\)hours to it. Well,in a CAT, if you had got an answer choice that says 12:39pm then you might have fallen into the trap and FAILED THE QUESTION pitifully with your head held high. I would always want to follow the question prompt like I'm not too smart.
Hi Nez, You are absolutely correct that a Q like this can be blown to pieces if you take one wrong step.. If I were to do this, I will not get into making equation... i will see how much distance is left between two when both are in motion.. 1) in 10 min, train from K to T would have travelled= 240*10/60=40.. 2) so distance between the two when Train starts from T to K= 300-40=260.. 3) combined speed as both travelling towards each other= 240+160=400. 4) they will meet after= 260/400 * 60=39 minutes.. time after 39 minutes= 12:10+39 min=12:49.. This method too finally does what the equation does but slightly less error prone
Re: A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
12 May 2017, 10:03
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at [#permalink]
Show Tags
13 May 2017, 08:35
buckkitty wrote:
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at 12 noon. Ten minutes later, a train leaves Tokyo for Kyoto traveling 160 miles per hour. If Tokyo and Kyoto are 300 miles apart, at what time will the trains pass each other?
A. 12:40pm B. 12:49pm C. 12:55pm D. 1:00pm E. 1:05pm
[b]AS, later train start ten minutes later , so the first train(from Kyoto to Tokyo) cover distance in ten minutes equals
(240/60*10 ) 40 miles. Rest of the distance 300-40 = 260.therefore, two train together will cover up this distance
Relative speed will be (240 + 160) 400 Miles per hour. required time = (260/400*60) 39 minutes.
Total time would be 39+10 = 49 minutes . they will pass each other at 12: 49 pm.
Kudos if it helps.Thanks
gmatclubot
A bullet train leaves Kyoto for Tokyo traveling 240 miles per hour at
[#permalink]
13 May 2017, 08:35
There’s something in Pacific North West that you cannot find anywhere else. The atmosphere and scenic nature are next to none, with mountains on one side and ocean on...
This month I got selected by Stanford GSB to be included in “Best & Brightest, Class of 2017” by Poets & Quants. Besides feeling honored for being part of...
Joe Navarro is an ex FBI agent who was a founding member of the FBI’s Behavioural Analysis Program. He was a body language expert who he used his ability to successfully...
close
68% (03:04) correct
1
