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:
276 comments Page 1 of 28.
Saikiran said:
2 decades ago
Length of the train = (15 x 20)m = 300 m.
how u took (15*20).
how u took (15*20).
Sivramakrishna said:
2 decades ago
How you took (15*20)?
Gokul said:
2 decades ago
Guys I got the answer its because.
Distance=Time*Speed.
Distance=Time*Speed.
Sahil said:
2 decades ago
Distance= speed*time
300=15*20
this is length of a train only and we have to find out length of a plateform so we add length of both train and plateform becoz in case of bridge or plateform we can add both the length.
then
x+300/36=15
=240m
300=15*20
this is length of a train only and we have to find out length of a plateform so we add length of both train and plateform becoz in case of bridge or plateform we can add both the length.
then
x+300/36=15
=240m
Sheik said:
2 decades ago
Me also have the same doubt.
Sahil,
Dis= s*t is okay.
Why didn't we take 300=15*36.
Please explain.
Sahil,
Dis= s*t is okay.
Why didn't we take 300=15*36.
Please explain.
Shiva said:
2 decades ago
How is that you have taken (15 x 20) m as train length?
Rajiv said:
2 decades ago
Why we do (15*20) ?
Siva krishna said:
2 decades ago
I have also same doubt explain me
Vetri said:
2 decades ago
Train passes 36 sec but man standing 20sec so (36-20=16)
speed= 15m/sec
length=16*15=240m
speed= 15m/sec
length=16*15=240m
Priya said:
2 decades ago
Yeah the answer must be C. 300m.
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