Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 7)
7.
Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:
Answer: Option
Explanation:
Let the length of each train be x metres.
Then, distance covered = 2x metres.
Relative speed = (46 - 36) km/hr
| = |  |
10 x | 5 |  m/sec |
| 18 |
| = | |
25 | m/sec |
| 9 |
 |
2x | = | 25 |
| 36 | 9 |
2x = 100
x = 50.
Discussion:
234 comments Page 4 of 24.
Md. Habibur Rahman said:
6 years ago
When we calculated relative speed, Why we calculate 2x?
Relative speed means a train will be static. Then we can calculate x only. Am ai right? Please tell me.
Relative speed means a train will be static. Then we can calculate x only. Am ai right? Please tell me.
(1)
Shantanu singh parihar said:
5 years ago
We have 2x cause,
When the faster train passes to slower,
It is covering;
X+X distance(slower train +higher speed train),
So the total distance covered is 2X.
When the faster train passes to slower,
It is covering;
X+X distance(slower train +higher speed train),
So the total distance covered is 2X.
(1)
Yuva kumar said:
4 years ago
How 2x/36 = 25/9? Please explain me.
(1)
DHANASURIYA M G said:
1 week ago
The length of each train is 50 meters.
This is determined by calculating the relative speed of the two trains and the time taken for the quicker train to pass the slower train.
This is determined by calculating the relative speed of the two trains and the time taken for the quicker train to pass the slower train.
(1)
Vasanthvasu said:
2 decades ago
Length of the train =X m
by converting it into km...........
(X/36)*(18/5)=X/10 KM
X/10 = 46-36 = 10
X=100
both are same length
therefore
2X=100 ..... LENGTH OF BOTH TRAIN
X=50........ LENGTH OF EACH TRAIN
by converting it into km...........
(X/36)*(18/5)=X/10 KM
X/10 = 46-36 = 10
X=100
both are same length
therefore
2X=100 ..... LENGTH OF BOTH TRAIN
X=50........ LENGTH OF EACH TRAIN
Suvarna said:
2 decades ago
But...
why this is needed???
"Let the length of each train be x metres.
Then, distance covered = 2x metres"
why this is needed???
"Let the length of each train be x metres.
Then, distance covered = 2x metres"
Akshat said:
2 decades ago
It should be mentioned that the faster train started behind the slower train.
Swapnil said:
2 decades ago
How you hav taken distance covered = 2x? please explain.
Mathan said:
2 decades ago
How you taken this as 2x? please explain.
Santhosh said:
2 decades ago
Because two trains are there.
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