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:
254 comments Page 15 of 26.
SK Lodhi said:
1 decade ago
130+B = 30 Sec.*45*5/18 m/s(time*speed).
130+B = 375 m.
Where B = length of the Bridge = 375 - 130 = 245 meters.
130+B = 375 m.
Where B = length of the Bridge = 375 - 130 = 245 meters.
Prakash said:
2 decades ago
speed=[45*(5/18)]=25/2 m/hr
time=30 sec
s=d/t
distance= speed*time
(25/2)* 30=375
375-130= 245
is this ryt
time=30 sec
s=d/t
distance= speed*time
(25/2)* 30=375
375-130= 245
is this ryt
Sohini nandi said:
1 decade ago
Train goes in 30 sec : 30*45*(5/18) = 375 m.
Its length = 130 m.
Therefore bridges length = (375-130)m = 245 m.
Its length = 130 m.
Therefore bridges length = (375-130)m = 245 m.
Sunil Kumar said:
1 decade ago
Let bridge length x m then.
Length of train = 130.
Speed 45*5/18 = 12.5.
Distance=12.5*30 = 375.0-130 = 245.
Length of train = 130.
Speed 45*5/18 = 12.5.
Distance=12.5*30 = 375.0-130 = 245.
Anil Bhadani said:
9 years ago
45 km *30 sec /3600 sec = 375m.
So length of bridge = passes length - length of train = 375m - 130 m = 245m.
So length of bridge = passes length - length of train = 375m - 130 m = 245m.
Imthiyaz ahmed said:
1 decade ago
25 meters per 2 sec, 1 sec = 12.5 *30sec = 375-130 = 245 very simple and very fast way to tackle the problem.
Akhil said:
10 years ago
Hi, can anyone tell me how to solve these type of problems?
I'm a just a beginner in maths. Please help me.
I'm a just a beginner in maths. Please help me.
Joy said:
9 years ago
=> 45 * 5/18 = 225/18 m/s,
=> 225/18*30 = 375(train can go max distance in 30s).
=> 375-130 = 245.
=> 225/18*30 = 375(train can go max distance in 30s).
=> 375-130 = 245.
Vaibhav mittal said:
9 years ago
Total distance covered by train in crossing the bridge = (25/2) *30=375.
Length of bridge = 375-130 =245.
Length of bridge = 375-130 =245.
Arman said:
9 years ago
In 30 second train goes= 45 x 1000 x 30 / 60 x 60 = 375 .
Bridge length = 375 - 130 = 245. Ans. 245.
Bridge length = 375 - 130 = 245. Ans. 245.
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