Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 21)
21.
How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
Answer: Option
Explanation:
| Speed of the train relative to man | = (63 - 3) km/hr | |||||||
| = 60 km/hr | ||||||||
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|
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 Time taken to pass the man |
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| = 30 sec. |
Discussion:
44 comments Page 5 of 5.
Nirmal said:
5 years ago
@Smith.
In this type of problems, you can consider one object (train or man) is steady and give the velocity of that steady object give to another object.
If they are in the same direction than minus and if the direction is opposite than add the velocities.
In this type of problems, you can consider one object (train or man) is steady and give the velocity of that steady object give to another object.
If they are in the same direction than minus and if the direction is opposite than add the velocities.
(1)
Sonam Lhadon said:
5 years ago
How it 50/3 becomes 3/50?
Anyone, please explain it.
Anyone, please explain it.
Veda said:
5 years ago
After converting 60km/h to m/s.
We want to find the time t = l/s.
T=500/50/3.
3 is in the denominator.
Denominator of the denominator goes to the numerator then we get 500*3/50=30.
We want to find the time t = l/s.
T=500/50/3.
3 is in the denominator.
Denominator of the denominator goes to the numerator then we get 500*3/50=30.
(1)
Pradnya Desai said:
5 years ago
The train and the man are moving in the same direction and hence for the train to catch up and pass. The man it should first overcome the speed of the man that is 3km/hr and hence that's why we subtract 3 from 63kms/hr which is the speed of the train.
(2)
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