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 1 of 24.
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.
Sundar said:
1 decade ago
Hi Afshu,
Since both trains are in same length, we are taking it as 2X (X + X) in order to calculate the distance.
Otherwise, if the length of the trains are different then we will take it as X1 + X2 for calculating the length.
Have a nice day!
Since both trains are in same length, we are taking it as 2X (X + X) in order to calculate the distance.
Otherwise, if the length of the trains are different then we will take it as X1 + X2 for calculating the length.
Have a nice day!
Afshu said:
1 decade ago
Thanks Sundar.
Mani said:
1 decade ago
Why we difference the speed of 2 trains ?
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