GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 26 Aug 2019, 00:20

Close

GMAT Club Daily Prep

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.

Close

Request Expert Reply

Confirm Cancel

Does the train of the speed exceed 80 km/hr?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Intern
Intern
avatar
B
Joined: 20 Oct 2018
Posts: 26
Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 04 Aug 2019, 07:49
1
1
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

42% (01:26) correct 58% (01:01) wrong based on 50 sessions

HideShow timer Statistics

Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device
Director
Director
avatar
P
Joined: 19 Oct 2018
Posts: 791
Location: India
Premium Member
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 04 Aug 2019, 17:12
Let the length of train=L
and the velocity of train=v

Statement 1-
\(\frac{L}{v}=8\)
We have 2 unknowns and 1 equation
\(Insufficient\)

Statement 2-
\(\frac{L+150}{v}=12\)
Again, We have 2 unknowns and 1 equation
\(Insufficient\)

Combining both statements
L/v+150/v=12
From statement 1 L/v=8
8+150/v=12
v=150/4 m/s
Sufficient



JayPatadiya wrote:
Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device
Director
Director
User avatar
V
Joined: 27 May 2012
Posts: 840
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 05 Aug 2019, 01:41
JayPatadiya wrote:
Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device


Hi JayPatadiya,
Thanks for the question, just a small correction required here. Instead of " Train of the speed" we should have " Speed of the train ".
Hope you will look into this. Thanks.
_________________
- Stne
Intern
Intern
avatar
B
Joined: 20 Oct 2018
Posts: 26
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 05 Aug 2019, 01:45
stne wrote:
JayPatadiya wrote:
Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device


Hi JayPatadiya,
Thanks for the question, just a small correction required here. Instead of " Train of the speed" we should have " Speed of the train ".
Hope you will look into this. Thanks.


Thanks for highlighting, I apologise for the typo error.
Manager
Manager
avatar
S
Joined: 18 Apr 2019
Posts: 66
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 05 Aug 2019, 05:42
1
JayPatadiya wrote:
Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device


This question tries to trick us into choosing option B.
What we have to realize here is that the total distance for a train to cross is the sum of the distance it needs to cross + its own length.
For a point object such as a person, it is equal to the trains own length.

With this in mind, let's proceed.
S1: All we can conclude from this statement is that the length of train = 8*speed.
Cannot find speed

S2:
Total distance + 150 + length of train
time = 12 sec
Don't know the length of train. INSUFF

S1 +S2
we have everything.
SUFF
Intern
Intern
avatar
B
Joined: 20 Oct 2018
Posts: 26
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

Show Tags

New post 12 Aug 2019, 23:39
Karmesh wrote:
JayPatadiya wrote:
Does the train of the speed exceed 80 km/hr?

1. The train crosses a standing person in 8 sec.

2. The train takes 12 sec to cross a 150m long bridge.

Posted from my mobile device


This question tries to trick us into choosing option B.
What we have to realize here is that the total distance for a train to cross is the sum of the distance it needs to cross + its own length.
For a point object such as a person, it is equal to the trains own length.

With this in mind, let's proceed.
S1: All we can conclude from this statement is that the length of train = 8*speed.
Cannot find speed

S2:
Total distance + 150 + length of train
time = 12 sec
Don't know the length of train. INSUFF

S1 +S2
we have everything.
SUFF


I was getting incorrect answer because I of tricky part only. Thanks for correcting here. I appreciate it.
GMAT Club Bot
Re: Does the train of the speed exceed 80 km/hr?   [#permalink] 12 Aug 2019, 23:39
Display posts from previous: Sort by

Does the train of the speed exceed 80 km/hr?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne