Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 1)
1.
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
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 34 of 61.
Rubiya said:
1 decade ago
@Gowtham.
If train length is more then it takes more time to cross the pole. If it is small train then it takes less time to cross the pole.
If train length is more then it takes more time to cross the pole. If it is small train then it takes less time to cross the pole.
Rubiya said:
1 decade ago
If train takes 20 seconds means taking more time to cross the pole. It means length of train is more 20*50/3 is 333.3. Therefore here train length increases.
Dinesh said:
1 decade ago
It has come approximately 150.03 is this correct or exact answer should be 150.
Satyapal khetlan said:
1 decade ago
Given: Train velocity = 60 km/hr;
It's mean that at 1 hr, traveled distance by train, is 60 km;
1 sec. travel distance = 60,000/(3600) m (1 hr = 3600 sec. & 1 km = 1000 m).
So, 9 sec " " = (100/6)*9 m.
= 150 m.
So, 150 m, should be correct answer;
It's mean that at 1 hr, traveled distance by train, is 60 km;
1 sec. travel distance = 60,000/(3600) m (1 hr = 3600 sec. & 1 km = 1000 m).
So, 9 sec " " = (100/6)*9 m.
= 150 m.
So, 150 m, should be correct answer;
Grace said:
1 decade ago
60000 = 3600.
x = 9.
Cross multiply.
= 3600 x/60000*9.
Answer is 150.
x = 9.
Cross multiply.
= 3600 x/60000*9.
Answer is 150.
Arvind_ap said:
1 decade ago
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s.
= 10/36 m/s.
= 5/18 m/s.
1 km/hr = 5/18 m/sec.
60 km/hr = 60 x 5/18 m/sec.
= (60 x 5)/18.
= 300/18.
So in 1 sec speed is 16.66.
9 sec = 16.66*9 = 150.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s.
= 10/36 m/s.
= 5/18 m/s.
1 km/hr = 5/18 m/sec.
60 km/hr = 60 x 5/18 m/sec.
= (60 x 5)/18.
= 300/18.
So in 1 sec speed is 16.66.
9 sec = 16.66*9 = 150.
Mohammed asif said:
1 decade ago
Similarly 60 km/hr = 60 x 5/18 m/sec.
Kindly explain how this line how 150 meters came?
Kindly explain how this line how 150 meters came?
Bob Matthew said:
1 decade ago
@Mohammed Asif.
60x5/18=50/3. Now since the train crossed the pole in 9 seconds you multiply 50/3x9=150.
Hope this helps.
60x5/18=50/3. Now since the train crossed the pole in 9 seconds you multiply 50/3x9=150.
Hope this helps.
Peter said:
1 decade ago
Can someone please explain how 60x5/18=50/3?
Simon Newfield said:
1 decade ago
@Peter.
60x5/18 = 50/3 because 60x5/18 = 16.
66666666666667 Now we must convert this to a whole number which is 50. To get 50 you must multiply 16.66666666666667 with 3.
So you write it down as 50/3 because 50/3 equals 16.66666666666667.
60x5/18 = 50/3 because 60x5/18 = 16.
66666666666667 Now we must convert this to a whole number which is 50. To get 50 you must multiply 16.66666666666667 with 3.
So you write it down as 50/3 because 50/3 equals 16.66666666666667.
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