Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 8)
8.
A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Answer: Option
Explanation:
| Formula for converting from km/hr to m/s: X km/hr = |  |
X x | 5 |  |
m/s. |
| 18 |
| Therefore, Speed = | |
45 x | 5 | m/sec |
= | 25 | m/sec. |
| 18 | 2 |
Total distance to be covered = (360 + 140) m = 500 m.
| Formula for finding Time = | |
Distance | |
| Speed |
 Required time = |
|
500 x 2 | sec |
= 40 sec. |
| 25 |
Discussion:
78 comments Page 7 of 8.
Muthu said:
1 decade ago
How can u take total distance to be 500???
Priya said:
1 decade ago
@ Dwaraka.
Regarding this prob (A train 470 m long is running at a speed of 55 km/hr. In what time will it pass a bridge 140 m long?).
I understood the solution but it ll take quit time to solve. Can you please provide some shortcut trick to solve.
Regarding this prob (A train 470 m long is running at a speed of 55 km/hr. In what time will it pass a bridge 140 m long?).
I understood the solution but it ll take quit time to solve. Can you please provide some shortcut trick to solve.
Paddy said:
2 decades ago
1km=1000m,1hr=60min*60sec i.e1km/hr=1000/60*60i.e 5/18
Paddy said:
2 decades ago
5/18 comes .because we want to express the unit of speed to m/s
1km/hr=1000m/3600s=5/18 m\s
1km/hr=1000m/3600s=5/18 m\s
Sam said:
2 decades ago
Hi How x*5/18 came there can't understand
Dwaraka said:
2 decades ago
Hi rajasekaran the solution
speed=55km/hr
= (55*1000)/(60*60)
=15.27m/s
Total distance=the bridge distance+distance of the train to cross the bridge
d=470+140=610
time=d/s=610/15.27=39.94s
speed=55km/hr
= (55*1000)/(60*60)
=15.27m/s
Total distance=the bridge distance+distance of the train to cross the bridge
d=470+140=610
time=d/s=610/15.27=39.94s
Antony said:
2 decades ago
How it should come 25/2,could you explain me as soon as possible
Rajasekaran said:
2 decades ago
A train 470 m long is running at a speed of 55 km/hr. In what time will it pass a bridge 140 m long?
pls explain it
pls explain it
Ramashish mallah said:
2 decades ago
Thank You.
Rahul, You explained very well and cleared all my confusing.
I am greatful to you.
Regards,
Ramashish Mallah
ramashish.mallah[at]gmail.com
Rahul, You explained very well and cleared all my confusing.
I am greatful to you.
Regards,
Ramashish Mallah
ramashish.mallah[at]gmail.com
Antony said:
2 decades ago
5/18 comes .because we want to express the unit of speed to m/s
1km/hr=1000m/3600s=5/18 m\s
1km/hr=1000m/3600s=5/18 m\s
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