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:
587 comments Page 15 of 59.
Kopila said:
2 months ago
@All.
The answer here calculated is the distance of the train travelled in 9 seconds right, then how can you claim it as the length if the train?
The answer here calculated is the distance of the train travelled in 9 seconds right, then how can you claim it as the length if the train?
(6)
Rajakumara said:
3 years ago
It's a very good explanation to understand the equation. Thanks, everyone.
(5)
NARINDER KUMAR said:
2 years ago
9 = D*18/60 * 5 (USE S=D/T) AND (COVERT KM/HOUR IN TO M/SEC ) * 5/18.
So,
1 = D*2/300,
D = 300/2,
D = 150.
So,
1 = D*2/300,
D = 300/2,
D = 150.
(5)
Pavan sai Rama said:
2 years ago
(MLT) Medical Lab Technician.
(5)
Sree nithi said:
10 months ago
Answer should be 150
(5)
Akshata said:
9 months ago
60 * 5/18 = 50/3,
Length = speed * time.
l = 50/3 * 9sec= 150 meters.
Length = speed * time.
l = 50/3 * 9sec= 150 meters.
(5)
Kishan bhanja said:
8 months ago
Speed = 60 km/h = 60 * 5/18 = 50/3 m/s.
Time taken = 9 sec.
Length = speed * time = 50/3 * 9 =150 m.
Time taken = 9 sec.
Length = speed * time = 50/3 * 9 =150 m.
(5)
Vee said:
7 months ago
I also don’t understand how 50/3 and 5/18 came? Anyone, please explain.
(5)
Shraddha Jadhav said:
4 months ago
150 is the correct answer.
(5)
Nandhini Devaraj said:
1 week ago
To know: If the train crosses the pole.
The total distance travelled by train would be its length.
To do: So, calculate the distance travelled by the train to cross the pole.
Formula: Distance(d) = Speed x Time.
Given: Speed of Train 60 km/hr, Time taken to cross a pole = 9 seconds.
Steps:
1. the speed is given in "km/hr" but time is in "Seconds"... Multiplying speed in km/hr directly with time in seconds is not valid.
2. Now, to convert to m/s...
speed = 60 x 5/18 = 16.67 m/s.
3. Distance(d) = 16.67 x 9 = 150 meters.
Final answer: The length of the train is 150 meters.
The total distance travelled by train would be its length.
To do: So, calculate the distance travelled by the train to cross the pole.
Formula: Distance(d) = Speed x Time.
Given: Speed of Train 60 km/hr, Time taken to cross a pole = 9 seconds.
Steps:
1. the speed is given in "km/hr" but time is in "Seconds"... Multiplying speed in km/hr directly with time in seconds is not valid.
2. Now, to convert to m/s...
speed = 60 x 5/18 = 16.67 m/s.
3. Distance(d) = 16.67 x 9 = 150 meters.
Final answer: The length of the train is 150 meters.
(5)
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