Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 3)
3.
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Answer: Option
Explanation:
| Speed = |  |
45 x | 5 |  m/sec |
= | |
25 | m/sec. |
| 18 | 2 |
Time = 30 sec.
Let the length of bridge be x metres.
| Then, | 130 + x | = | 25 |
| 30 | 2 |
2(130 + x) = 750
x = 245 m.
Video Explanation: https://youtu.be/M_d8WufJWKc
Discussion:
249 comments Page 1 of 25.
Akash S said:
6 days ago
A= 130m.
Speed of train = 45km/hr in 30 seconds.
45 = 30 * 5/18.
X = 150/18 * 45 m/s.
X = 375m/s.
Length = X - A.
375-130 = 245.
Speed of train = 45km/hr in 30 seconds.
45 = 30 * 5/18.
X = 150/18 * 45 m/s.
X = 375m/s.
Length = X - A.
375-130 = 245.
(1)
Shabeer said:
2 weeks ago
How 5/18 will came? Please explain.
(1)
Sidheswar Pradhan said:
1 month ago
1 km/hr = 1km/1hr.
= 1000 m/3600 sec,
= 10/36 m/s,
= 5/18 m/s.
= 1000 m/3600 sec,
= 10/36 m/s,
= 5/18 m/s.
(4)
Anonymous said:
1 month ago
I am not getting this answer. Anyone, please help me by explaining it.
(2)
Vikash Kumar Bharti said:
5 months ago
Given, train length s = 130.
Let, the bridge length is x.
Total passing length = velocity * time.
S + x = vt.
130 + x = 45 * (5/18) * 30.
x = 245m.
Let, the bridge length is x.
Total passing length = velocity * time.
S + x = vt.
130 + x = 45 * (5/18) * 30.
x = 245m.
(27)
Fearless said:
5 months ago
The speed of train in sec = 45000/3600 = 12.5sec.
distance travel by train in 30 sec = 12.5 * 30 = 375m,
lenght of train = 130m.
Length of bridge = distance traveled by the train - length of train.
= 375-130 = 245m.
distance travel by train in 30 sec = 12.5 * 30 = 375m,
lenght of train = 130m.
Length of bridge = distance traveled by the train - length of train.
= 375-130 = 245m.
(49)
Vijay said:
6 months ago
1 km = 1000 m,
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
To convert the speed from km/hr to m/s, multiply the speed by 5/18.
To convert the speed from m/s to km/hr, multiply the speed by 18/5.
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
To convert the speed from km/hr to m/s, multiply the speed by 5/18.
To convert the speed from m/s to km/hr, multiply the speed by 18/5.
(10)
Kuenzang wangmo said:
7 months ago
How 5/18 came? Please explain to me.
(18)
Jimian said:
10 months ago
Given, train length s = 130.
Let, the bridge length is x.
Total passing length = velocity * time.
S + x = vt.
130 + x = 45 * (5/18) * 30.
x = 245m.
Let, the bridge length is x.
Total passing length = velocity * time.
S + x = vt.
130 + x = 45 * (5/18) * 30.
x = 245m.
(25)
Muzammil said:
1 year ago
Length of train 130, speed 45 km/hr it crosses the bridge in 30 seconds.
What is the length of the bridge?
45km = 45000 m
1hr = 3600 s.
So
45000/3600 = 12.5 m/s
the train crosses a bridge in 30 sec then
12.5 * 30 = 375
The train travelled 375 in 30 sec.
Then distance - train length = bridge length.
375 - 130 =245.
bridge length = 245.
What is the length of the bridge?
45km = 45000 m
1hr = 3600 s.
So
45000/3600 = 12.5 m/s
the train crosses a bridge in 30 sec then
12.5 * 30 = 375
The train travelled 375 in 30 sec.
Then distance - train length = bridge length.
375 - 130 =245.
bridge length = 245.
(95)
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