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 2 of 8.
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
Antony said:
2 decades ago
How it should come 25/2,could you explain me as soon as possible
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
Sam said:
2 decades ago
Hi How x*5/18 came there can't understand
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
Paddy said:
2 decades ago
1km=1000m,1hr=60min*60sec i.e1km/hr=1000/60*60i.e 5/18
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.
Muthu said:
1 decade ago
How can u take total distance to be 500???
Pavani_reddy said:
1 decade ago
Hi divya.........
Here all ans's are in seconds so we hav to convert km/hr to m/sec
So
1km=1000m
1hr=3600s
1km/hr=1000/3600 m/s
1km/hr=5/18m/sec
Have a nice day guys.................
Here all ans's are in seconds so we hav to convert km/hr to m/sec
So
1km=1000m
1hr=3600s
1km/hr=1000/3600 m/s
1km/hr=5/18m/sec
Have a nice day guys.................
Saranya said:
1 decade ago
Hi,
Me too having same problem... why we can take total distance... they didn't mentioned anything that to cover total distance... they asked how long it ll take pass 140m long... please can any one explain...
Me too having same problem... why we can take total distance... they didn't mentioned anything that to cover total distance... they asked how long it ll take pass 140m long... please can any one explain...
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers