Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 5)
5.
A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
Answer: Option
Explanation:
| Speed = |  |
54 x | 5 |  m/sec = 15 m/sec. |
| 18 |
Length of the train = (15 x 20)m = 300 m.
Let the length of the platform be x metres.
| Then, | x + 300 | = 15 |
| 36 |
x + 300 = 540
x = 240 m.
Discussion:
282 comments Page 17 of 29.
Bharat said:
1 decade ago
v=d/t;. 15=d/36; d=540.
v=d/t ; 15=d/20 = d=300;
540-300 = 240.
v=d/t ; 15=d/20 = d=300;
540-300 = 240.
Sunil Ranjan Samantaray said:
1 decade ago
Why length of the train will be 15*20 = 300?
Why not, length of train will be 15*36 = 540?
Please justify the reason.
Why not, length of train will be 15*36 = 540?
Please justify the reason.
Chinu said:
1 decade ago
Please explain why we took x+300?
Harshini said:
1 decade ago
We have the formula.
Distance = Speed*Time.
= 15*20
= 300
Distance = Speed*Time.
= 15*20
= 300
Manoj Dhawade said:
1 decade ago
We have to do 15*36 because train crosses the platform in 36 sec. So the answer should be 300 m.
Manoj dhawade said:
1 decade ago
We have to do 15*(36-20) because train crosses the platform in 36 sec and the man in 20 sec. So the answer should be 240 m.
Nadeem said:
1 decade ago
In first row why second has been cancelled.
Austin said:
1 decade ago
Hello guys you can this problem in this way also.
Train Time = 36 second.
Men time = 20 second.
(36-20) = 16.
Speed = 54km/hr
54*5/18 = 15ms.
Distance = 15*16 = 240m.
Train Time = 36 second.
Men time = 20 second.
(36-20) = 16.
Speed = 54km/hr
54*5/18 = 15ms.
Distance = 15*16 = 240m.
Mohammed ali said:
1 decade ago
Hai friend I will put in another way you will sub higher to lower 36-20 you will get 16 answer and you can multiple:
16*54 = 864.
= 864*5/18.
= 4320/18.
= 240 answer.
16*54 = 864.
= 864*5/18.
= 4320/18.
= 240 answer.
Ajit said:
1 decade ago
First find out gap of time between train and man, then multiple train speed, then we got platform length.
Gap time = 36-20 = 16.
Then, train speed = 54*5/18 = 15 m/s.
Now, platform length = 16*15 = 240 m.
Gap time = 36-20 = 16.
Then, train speed = 54*5/18 = 15 m/s.
Now, platform length = 16*15 = 240 m.
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