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04 Aug 2019, 07:49
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
39% (01:24) correct
61%
(01:01)
wrong
based on 54
sessions
History
Date
Time
Result
Not Attempted Yet
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.
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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
Archived Topic
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04 Aug 2019, 17:12
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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
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
05 Aug 2019, 01:41
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JayPatadiya
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.
