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

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Intern
Joined: 20 Oct 2018
Posts: 39
Does the train of the speed exceed 80 km/hr?  [#permalink]

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04 Aug 2019, 06:49
1
1
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Difficulty:

75% (hard)

Question Stats:

38% (01:26) correct 62% (01:03) wrong based on 55 sessions

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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
DS Forum Moderator
Joined: 19 Oct 2018
Posts: 1826
Location: India
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

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04 Aug 2019, 16:12
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

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
VP
Joined: 27 May 2012
Posts: 1029
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

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05 Aug 2019, 00:41
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

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
Joined: 20 Oct 2018
Posts: 39
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

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05 Aug 2019, 00:45
stne 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

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
Joined: 18 Apr 2019
Posts: 78
Location: India
GMAT 1: 720 Q48 V40
GPA: 4
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

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05 Aug 2019, 04:42
1
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
Joined: 20 Oct 2018
Posts: 39
Re: Does the train of the speed exceed 80 km/hr?  [#permalink]

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12 Aug 2019, 22:39
Karmesh 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.
Re: Does the train of the speed exceed 80 km/hr?   [#permalink] 12 Aug 2019, 22:39