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:
232 comments Page 4 of 24.
Md. Habibur Rahman said:
5 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:
3 years ago
How 2x/36 = 25/9? Please explain me.
(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.
Afshu said:
1 decade ago
Why can't we assume.
Length of the 1st train as x metres and Length of the second train as y metres?
Please explain.
Length of the 1st train as x metres and Length of the second train as y metres?
Please explain.
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