Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 4)
4.
Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:
Answer: Option
Explanation:
Let the speeds of the two trains be x m/sec and y m/sec respectively.
Then, length of the first train = 27x metres,
and length of the second train = 17y metres.
 |
27x + 17y | = 23 |
| x+ y |
27x + 17y = 23x + 23y
4x = 6y
| |
x | = | 3 | . |
| y | 2 |
Discussion:
233 comments Page 13 of 24.
Rabish pandey said:
1 decade ago
Really it is helpful to get qualify related aptitude exam I thank from my side to indiabix. Com and easy to understand solution also.
Mukesh said:
9 years ago
Total distance / total speed = total time.
This is the simple solution (X + Y) = relative speed.
Trains comes towards each other.
This is the simple solution (X + Y) = relative speed.
Trains comes towards each other.
Pradeep kumar said:
1 decade ago
Also calculate as train 1 = 27sec.
Train 2 = 17sec.
Ratio of train 1 & train 2.
27/17 = 1.588.
We have an option 3/2 = 1.5.
Train 2 = 17sec.
Ratio of train 1 & train 2.
27/17 = 1.588.
We have an option 3/2 = 1.5.
Arunakar reddy said:
9 years ago
Length/speed = time.
Here,
Total length = 27x + 17y.
Speed = x + y.
Given time = 23 sec
So,
27x + 17y
------------- = 23
x + y.
Here,
Total length = 27x + 17y.
Speed = x + y.
Given time = 23 sec
So,
27x + 17y
------------- = 23
x + y.
Gowtham said:
8 years ago
Its very shortcut and its very simple.
27 17
2 3
6 4
The ans is 3:2 (or) 6:4.
27 17
2 3
6 4
The ans is 3:2 (or) 6:4.
SWETHA.T said:
1 decade ago
SPEED = DISTANCE/TIME.
DISTANCE/SPEED = TIME.
i.e 27X+17Y/X+Y = 23.
DISTANCE/SPEED = TIME.
i.e 27X+17Y/X+Y = 23.
Swetha said:
1 decade ago
It can also be solved like this using the methods of allegation and mixture 27 17.
23.
6 4.
Thus ratio is 6:4 3:2.
23.
6 4.
Thus ratio is 6:4 3:2.
Jasminder said:
1 decade ago
27x+17y total distance.
X+y=total speed.
Total distance/total speed=total time.
Total time= 23 given.
Solve it.
X+y=total speed.
Total distance/total speed=total time.
Total time= 23 given.
Solve it.
Shree said:
1 decade ago
Its simple .
T = D/S
Therefore total distance = 27x+17y and total speed = x+y
Total time = 23
23= 27x+17y/x+y
T = D/S
Therefore total distance = 27x+17y and total speed = x+y
Total time = 23
23= 27x+17y/x+y
Chacko said:
1 decade ago
Can anyone say why is 27X+17Y = 23X+23Y....?
Ideally if we cross multiply, it should come as 27x+17Y = 23X-23Y.
Ideally if we cross multiply, it should come as 27x+17Y = 23X-23Y.
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