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 19 of 29.
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.
Baskar.R said:
1 decade ago
Speed = 54x5m/sec = 15 m/sec
15*36=540
man standing= 15*20=300
ans= platform length=540-200
ans= 240
15*36=540
man standing= 15*20=300
ans= platform length=540-200
ans= 240
Mvk said:
1 decade ago
S (km/hr to m/s) => 54 * 5/18 = 15.
T = (36s - 20s) = 16s.
D = S * T = 15 * 16 = 240m.
T = (36s - 20s) = 16s.
D = S * T = 15 * 16 = 240m.
Manisha dambe said:
8 years ago
Time to pass platform = 16s,
length of platform=t*s,
= 16*54*5/18=245.
The length of platform=245 m.
length of platform=t*s,
= 16*54*5/18=245.
The length of platform=245 m.
Rock said:
1 decade ago
Train speed = 15 m/s.
Time different = 36-20 = 16 sec.
Length of platform is 16*15 = 240 meter.
Time different = 36-20 = 16 sec.
Length of platform is 16*15 = 240 meter.
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.
Swamy said:
1 decade ago
Well,
36 sec - 20 sec = 16 sec.
Then,
36 sec ----- 540 mt.
16 sec ----240 mt (train length).
36 sec - 20 sec = 16 sec.
Then,
36 sec ----- 540 mt.
16 sec ----240 mt (train length).
Ganesh Babu Korlapati said:
6 years ago
Why we cannot take 15*36.
Because dist = speed x time know. 36seconds is also speed only know.
Because dist = speed x time know. 36seconds is also speed only know.
Suresh said:
1 decade ago
Satheesh your answer is very easy and simple way of maintain the problem solution. Thank you.
Tara said:
1 decade ago
The above answer can be solved by Jagadeesh & Verti given method, i thinkg its also rite.
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