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Aptitude - Problems on Trains - Discussion

Discussion Forum : Problems on Trains - General Questions (Q.No. 1)
Problems on Trains
1.
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
120 metres
180 metres
324 metres
150 metres
Answer: Option
Explanation:

Speed = 60 x 5 m/sec = 50 m/sec.
18 3

Length of the train = (Speed x Time).

Length of the train = 50 x 9 m = 150 m.
3

Discussion:
609 comments Page 25 of 61.
Thangaraj K. said:   1 decade ago
Answer = sec/speed*1000 (i.e. - multiplied with 1000 to convert to metres )

=9/60*1000 = 150m
Sai said:   1 decade ago
@SAI
Simply sperb
Suresh said:   1 decade ago
Imagine the pole as a car moving on the train(road) which has a distance of 150m. If the pole(car) takes 9 sec to complete 150m, then what is the speed?

speed of the pole(car)=150m/9sec

= 16.67ms-1

=16.67*(18/5)km/hr

=60km/hr
Janeth said:   1 decade ago
@Jayath how about -14x/100. I do not understand. Where did you get the number?
Thaya said:   1 decade ago
@ Kalimuthu

This was a nice Explaination
Shubham said:   1 decade ago
How did you calculate speed ?.
Gokul said:   1 decade ago
Really nice explanation.
Hitesh said:   1 decade ago
When I saw the explanation I was confused that why these gyes used 5/18 to multiply But now I got it. Thanks!
Sudharsan said:   1 decade ago
Let the length of the train be x.
3600/9=6000/x.
X=150m !
Satish said:   1 decade ago
Another simple way.
We have to find the length of the train (in mts).
Given in km/Hr ==> 5/18 mts/sec. (1).
Also given time to cross the post i.e. in Sec.
Multiply 1 & sec => (mts/sec) *sec ==mts (ur answer).
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