Model 4 Train Vs Pole/Signal Post/Man Section-Wise Topic Notes With Detailed Explanation And Example Questions
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The following question based on trains topic of quantitative aptitude
(a) 72 seconds
(b) 7.2 seconds
(c) 70 seconds
(d) 7.0 seconds
The correct answers to the above question in:
Answer: (b)
Speed of train = 50 kmph
= $({50 × 5}/18)$ m./sec. = $125/9$ m./sec.
Required time = $({100/125}/9)$ seconds
= $({100 × 9}/125)$ = 7.2 seconds
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Read more crossing pole signal post man Based Quantitative Aptitude Questions and Answers
Question : 1
A 120 m long train takes 10 seconds to cross a man standing on a platform. What is the speed of the train ?
a) 10 m/sec.
b) 15 m/sec.
c) 20 m/sec.
d) 12 m/sec.
Answer »Answer: (d)
Using Rule 1,
In crossing a man standing on platform, train crosses its own length.
Speed of train = $120/10 = 12$m/s
Question : 2
A train 180 metres long is running at a speed of 90 km/h. How long will it take to pass a post ?
a) 7.8 secs
b) 8 secs
c) 7.2 secs
d) 8.2 secs
Answer »Answer: (c)
Using Rule 1,
Speed of train = 90 kmph
= $(90 × 5/18)$ m/sec. = 25 m/sec.
When a train crosses a post, it covers a distance equal to its own length.
Required time = $\text"Distance"/ \text"Speed"$
= $180/25$ = 7.2 seconds
Question : 3
In what time will a train, 60 metre long, running at the rate of 36 km/hr pass a telegraph post ?
a) 8 seconds
b) 7 seconds
c) 6 seconds
d) 9 seconds
Answer »Answer: (c)
Speed of train = 36 kmph
= $({36 × 5}/18)$ m./sec. = 10 m./sec.
Required time = $\text"Length of train"/ \text"Speed of train"$
= $60/10$ = 6 seconds
Question : 4
The time taken by a train 160 m long, running at 72 km/hr, in crossing an electric pole is
a) 9 seconds
b) 6 seconds
c) 4 seconds
d) 8 seconds
Answer »Answer: (d)
Distance covered in crossing a pole
= Length of train Speed of train = 72 kmph
= $({72 × 5}/18)$ m./sec. = 20 m./sec.
Required time = $160/20$ = 8 seconds
Question : 5
A train 180 m long moving at the speed of 20 m/sec. over-takes a man moving at a speed of 10m/ sec in the same direction. The train passes the man in :
a) 9 sec
b) 18 sec
c) 27 sec
d) 6 sec
Answer »Answer: (b)
Using Rule 5,Let 'a' metre long train is running with the speed 'x' m/s. A man is running in same direction and with the speed 'y' m/s, then time taken by the train to cross the man = $a/{(x - y)}$seconds. And a = (x - y)t
Relative speed of man and train
= 20 - 10 = 10m/sec.
Required time = $180/10$ = 18 seconds
Question : 6
A train passes an electrical pole in 20 seconds and passes a platform 250 m long in 45 seconds. Find the length of the train.
a) 200m
b) 300m
c) 250m
d) 400m
Answer »Answer: (a)
Using Rule 1,
If the length of train be x metre, then speed of train
= $x/20 = {x + 250}/45$
$x/4 = {x + 250}/9$
9x = 4x + 1000
9x - 4x = 1000
5x = 1000
x = $1000/5$ = 200 metre
trains Shortcuts and Techniques with Examples
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Model 1 Train Vs Train in same direction
Defination & Shortcuts … -
Model 2 Train Vs Train in opposite direction
Defination & Shortcuts … -
Model 3 Train Vs Bridge/Platform
Defination & Shortcuts … -
Model 4 Train Vs Pole/Signal Post/Man
Defination & Shortcuts … -
Model 5 Train Vs Both platform and a man/a pole
Defination & Shortcuts … -
Model 6 Change in speed Vs Change with time travel
Defination & Shortcuts …
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